Light: Properties, Reflection, Refraction, and Lenses

Question 1

When light hits a smooth surface, what factor determines the angle at which it bounces off?

Accepted Answer

Angle of incidence

Answer

Wavelength of light

Answer

Intensity of light

Answer

Color of light

Question 2

What is a characteristic of light?

Accepted Answer

It travels in a straight line.

Accepted Answer

It can be absorbed or reflected.

Answer

It has weight.

Question 3

Which equation calculates the focal length (f) of a lens using the object distance (d_o) and the image distance (d_i)?

Accepted Answer

f = 1 / d_o + 1 / d_i

Answer

f = d_o + d_i

Answer

f = d_o - d_i

Answer

f = d_o * d_i

Question 4

When light travels from air into glass, it changes direction. Which property of the glass causes this change in direction?

Accepted Answer

Refractive index

Answer

Density

Answer

Thickness

Answer

Color

Question 5

How do the properties of light, such as wavelength and intensity, affect the operation and applications of LEDs?

Accepted Answer

Wavelength determines the color of light emitted by an LED, while intensity determines its brightness.

Answer

Intensity determines the color of light emitted by an LED, while wavelength determines its brightness.

Answer

Both wavelength and intensity have no effect on the operation of LEDs.

Answer

Wavelength determines the brightness of the light emitted by an LED, while intensity determines its color.

Question 6

When light travels from air into water, it bends towards the normal. What is the reason for this bending of light?

Accepted Answer

Light slows down as it enters water because water is denser than air.

Answer

Light speeds up as it enters water because water is less dense than air.

Answer

The normal is a barrier that reflects light back into the air.

Answer

The bending of light is an optical illusion caused by the curvature of the earth.

Question 7

When white light splits into its different colors, like in a rainbow, what is this phenomenon called?

Accepted Answer

Dispersion

Answer

Reflection

Answer

Refraction

Answer

Absorption

Question 8

When light strikes a smooth, flat surface, which of the following occurs?

Accepted Answer

Reflection

Answer

Absorption

Answer

Transmission

Answer

Diffraction

Question 9

What is white light composed of?

Accepted Answer

All the colors of the rainbow

Answer

Red, blue, and green light

Answer

Only red and blue light

Answer

Only green and yellow light

Question 10

When white light passes through a prism, what happens?

Accepted Answer

Dispersion

Answer

Reflection

Answer

Absorption

Answer

Transmission

Question 11

What is the approximate value of the speed of light in a vacuum?

Accepted Answer

3 x 10^8 m/s

Answer

3 x 10^5 m/s

Answer

3 x 10^11 m/s

Answer

3 x 10^2 m/s

Question 12

When light hits a smooth surface, what does it do?

Accepted Answer

It is reflected.

Answer

It is absorbed.

Answer

It is refracted.

Answer

It is diffracted.

Question 13

What is the main reason we see a rainbow?

Accepted Answer

Sunlight refracting through water droplets

Answer

Sunlight reflecting off water droplets

Answer

Sunlight diffracting around water droplets

Answer

Sunlight absorbing into water droplets

Question 14

Which of these is a concave mirror?

Accepted Answer

[Image of a concave mirror]

Answer

[Image of a convex mirror]

Answer

[Image of a plane mirror]

Answer

[Image of a parabolic mirror]

Question 15

What is meant by the 'focal point' of a lens?

Accepted Answer

The point where parallel light rays meet after passing through the lens.

Answer

The point where diverging light rays meet after passing through the lens.

Answer

The point where converging light rays meet after passing through the lens.

Answer

The point where light rays are refracted the most.

Question 16

Which of these colours of light has the longest wavelength?

Accepted Answer

Red

Answer

Green

Answer

Blue

Answer

Violet

Question 17

Which of these materials allows light to pass through it clearly?

Accepted Answer

Glass

Answer

Wood

Answer

Metal

Answer

Paper

Question 18

How fast does light travel in a vacuum?

Accepted Answer

299,792,458 meters per second

Answer

1,000 miles per hour

Answer

186,000 miles per second

Answer

300 million kilometers per hour

Question 19

Which color of light has the longest wavelength?

Accepted Answer

Red

Answer

Yellow

Answer

Green

Answer

Blue

Question 20

What happens to a ray of light as it passes from air into water?

Accepted Answer

Bends toward the perpendicular

Answer

Continues in a straight line

Answer

Bends away from the perpendicular

Answer

Reflects back into the air

Question 21

When light strikes a smooth surface at an angle, it is reflected at an angle that is:

Accepted Answer

Equal to the angle of incidence.

Answer

Greater than the angle of incidence.

Answer

Less than the angle of incidence.

Answer

Perpendicular to the surface.

Question 22

When light moves from air into water, it bends towards the:

Accepted Answer

Normal.

Answer

Incident ray.

Answer

Reflected ray.

Answer

Absorbed ray.

Question 23

A converging lens can produce an image that is:

Accepted Answer

Sometimes inverted and sometimes upright.

Answer

Always inverted.

Answer

Always upright.

Answer

Always located at the focal point.

Question 24

The focal length of a lens is the distance between the lens and the:

Accepted Answer

Image.

Answer

Object.

Answer

Aperture.

Answer

Curvature.

Question 25

Which colour of visible light has the longest wavelength?

Accepted Answer

Red.

Answer

Green.

Answer

Blue.

Answer

Violet.

Question 26

In the law of reflection, the angle of incidence is equal to:

Accepted Answer

The angle of reflection

Answer

The angle of refraction

Answer

90 degrees

Answer

0 degrees

Question 27

What is the definition of magnification for mirrors?

Accepted Answer

Ratio of image height to object height

Answer

Ratio of image distance to object distance

Answer

Ratio of focal length to object distance

Answer

Ratio of focal length to image distance

Question 28

Which of these materials allows light to pass through without causing distortions?

Accepted Answer

Clear glass

Answer

Frosted glass

Answer

Brick wall

Answer

Wooden plank

Question 29

When light strikes an opaque surface, such as a brick wall, what happens to it?

Accepted Answer

It is absorbed

Answer

It is reflected

Answer

It is refracted

Answer

It passes through

Question 30

Which of these is NOT a property of light?

Accepted Answer

It has mass

Answer

It travels in a straight line

Answer

It can be reflected

Answer

It can be refracted

Question 31

When light travels from a medium where it travels faster (e.g., air) to a medium where it travels slower (e.g., water), what happens?

Accepted Answer

It bends towards the normal

Answer

It speeds up

Answer

It bends away from the normal

Answer

It slows down

Question 32

What is the term for the distance between the center of a lens and the point where parallel rays of light converge after passing through the lens?

Accepted Answer

Focal length

Answer

Radius of curvature

Answer

Image distance

Answer

Object distance

Question 33

Which colour of visible light has the longest wavelength?

Accepted Answer

Red

Answer

Green

Answer

Blue

Answer

Yellow

Question 34

When light changes direction due to a change in speed, we call this phenomenon:

Accepted Answer

Refraction

Answer

Reflection

Answer

Dispersion

Answer

Polarisation

Question 35

What is the name of the point where rays of light from an object meet after passing through a lens?

Accepted Answer

Image point

Answer

Focal point

Answer

Principal focus

Answer

Optical centre

Question 36

When light strikes a shiny surface, which phenomenon occurs?

Accepted Answer

It is reflected.

Answer

It is absorbed.

Answer

It is refracted.

Answer

It is dispersed.

Question 37

Which device below uses lenses to focus light and create images?

Accepted Answer

Camera

Answer

Flashlight

Answer

Mirror

Answer

Prism

Question 38

When a ray of light strikes a surface perpendicularly, what is the value of the angle of incidence?

Accepted Answer

0 degrees

Answer

30 degrees

Answer

45 degrees

Answer

90 degrees

Question 39

Light travels at different speeds through different materials. Which of the following best describes the relationship between the speed of light in a material and its refractive index?

Accepted Answer

The speed of light is inversely proportional to the refractive index.

Answer

The speed of light is directly proportional to the refractive index.

Answer

The speed of light is independent of the refractive index.

Question 40

Which of the following is NOT a property of light?

Accepted Answer

It has mass.

Answer

It travels in a straight line.

Answer

It is a form of energy.

Answer

It can be reflected.

Question 41

Which of the following is a transparent material?

Accepted Answer

Glass.

Answer

Wood.

Answer

Metal.

Answer

Paper.

Question 42

What is the main function of a lens?

Accepted Answer

To focus light.

Answer

To change the colour of light.

Answer

To make objects appear larger.

Answer

To produce a real image.

Question 43

Which material allows light to pass through it clearly?

Accepted Answer

Glass

Answer

Cardboard

Answer

Wood

Answer

Metal

Question 44

When light bounces off a surface and returns back in the same direction, it is referred to as:

Accepted Answer

Reflection

Answer

Refraction

Answer

Transmission

Answer

Absorption

Question 45

What happens to light when it moves from a denser material to a less dense material?

Accepted Answer

It bends away from the perpendicular line (normal)

Answer

It bends toward the perpendicular line (normal)

Answer

It bounces back

Answer

It travels in a straight line

Question 46

Which type of lens causes light rays to come together at a single point?

Accepted Answer

Convex lens

Answer

Concave lens

Answer

Plane mirror

Answer

Convex mirror

Question 47

What is the point where light rays converge after passing through a lens called?

Accepted Answer

Focal point

Answer

Center of curvature

Answer

Principal axis

Answer

Optical center

Question 48

Which type of image formed by a lens can be projected onto a screen?

Accepted Answer

Real image

Answer

Virtual image

Answer

Inverted image

Answer

Upright image

Question 49

What is the function of a diaphragm in a camera?

Accepted Answer

Controls the amount of light entering the camera

Answer

Adjusts the focus of the image

Answer

Magnifies the image

Answer

Protects the lens from scratches

Question 50

When light strikes a surface at an angle, the angle between the incoming light ray and the perpendicular line (normal) to the surface is known as the:

Accepted Answer

Angle of incidence

Answer

Angle of reflection

Answer

Angle of refraction

Answer

Angle of deviation

Question 51

How does a higher refractive index of a material affect the speed of light passing through it?

Accepted Answer

The higher the refractive index, the slower the speed of light.

Answer

The higher the refractive index, the faster the speed of light.

Answer

The refractive index has no effect on the speed of light.

Answer

The speed of light is the same in all materials, regardless of refractive index.

Question 52

When light moves from one transparent material to another, like from air to glass, its direction often changes. What is the main reason for this change?

Accepted Answer

The speed of light is different in the two materials.

Answer

Light is pulled towards the boundary between the two materials.

Answer

The path of light is determined by the shape of the boundary between the two materials.

Answer

The wavelength of light is different in the two materials.

Question 53

How do dispersion and refraction work together to create a rainbow when sunlight passes through raindrops?

Accepted Answer

Dispersion separates the different colors of light, and refraction bends the light rays as they pass through the raindrop.

Answer

The different colors of light are reflected off the inside of a raindrop, causing them to spread out into a rainbow.

Answer

The shape of a raindrop determines the order of the colors in a rainbow.

Answer

Rainbows are always circular because raindrops are always spherical.

Question 54

How does the polarization of light enable 3D glasses to create the illusion of depth?

Accepted Answer

It separates light waves based on their direction of vibration.

Answer

It focuses light waves into a specific area.

Answer

It increases the intensity of light.

Answer

It changes the color of light.

Question 55

Why is the speed of light considered a fundamental constant in the universe?

Accepted Answer

Because its value is the same for all observers, regardless of their motion

Answer

Because it is the fastest possible speed in the universe

Answer

Because light always travels at the same speed, regardless of the medium it passes through

Answer

Because it is the speed at which all objects fall towards the Earth

Question 56

In a compound microscope, what are the functions of the objective lens and the eyepiece lens?

Accepted Answer

Objective lens: Gathers light from the specimen and forms an image. Eyepiece lens: Magnifies the image formed by the objective lens.

Answer

Eyepiece lens: Gathers light from the specimen and forms an image. Objective lens: Magnifies the image formed by the eyepiece lens.

Answer

Both lenses focus and magnify light equally.

Question 57

How does adjusting the focal length of a convex lens impact the image it produces?

Accepted Answer

Modifies the image's size, orientation, and location.

Answer

Enlarges the image and inverts it.

Answer

Reduces the image size and keeps it upright.

Answer

Has no effect on the image.

Question 58

Which of the following is a fundamental property of light?

Accepted Answer

It can travel through a vacuum

Answer

It has a definite mass

Answer

It is composed of solid particles

Question 59

When light interacts with a surface, it may undergo which of the following processes?

Accepted Answer

Reflection, absorption, or transmission

Answer

Only reflection

Answer

Only absorption

Question 60

A concave mirror can produce:

Accepted Answer

Both real and virtual images

Answer

Only real images

Answer

Only virtual images

Answer

No images at all

Question 61

Which of the following devices utilizes lenses for focusing light?

Accepted Answer

Camera

Answer

Microphone

Answer

Loudspeaker

Answer

Battery

Question 62

When light transitions from a less dense to a more dense medium, its speed:

Accepted Answer

Decreases

Answer

Reverses direction

Answer

Increases

Answer

Remains unchanged

Question 63

According to the law of reflection, the angle of:

Accepted Answer

Incidence is equal to the angle of reflection

Answer

Incidence is less than the angle of reflection

Answer

Incidence and reflection are unrelated

Answer

Reflection is greater than the angle of incidence

Question 64

Which of the following is categorized as a type of electromagnetic radiation?

Accepted Answer

Light

Answer

Heat

Answer

Sound

Answer

Water