Light: Properties, Reflection, Refraction, and Lenses

Question 1

Which material allows the most light to pass through it?

Accepted Answer

Glass

Answer

Wood

Answer

Metal

Question 2

When light crosses a boundary between two different materials, it can either be reflected or refracted. What determines whether light is reflected or refracted?

Accepted Answer

The angle of the light

Answer

The wavelength of the light

Answer

The speed of the light

Answer

The color of the light

Question 3

In which scientific field is light used to observe tiny living organisms?

Accepted Answer

Biology

Answer

Chemistry

Answer

Physics

Answer

Geography

Question 4

As advanced optical technologies like facial recognition systems and surveillance cameras become more common, what's important to keep in mind when using them?

Accepted Answer

Consider the possible benefits and risks, and use them responsibly.

Answer

Only the police and government should use these technologies.

Answer

It doesn't matter how these technologies are used, they're always good.

Answer

Use them only to help people.

Question 5

Which type of optical fiber has the least loss and is ideal for transmitting light over vast distances, such as across oceans?

Accepted Answer

Single-mode fiber

Answer

Multimode fiber

Answer

Graded-index fiber

Answer

Plastic optical fiber

Question 6

Which of these is NOT a common use for lasers?

Accepted Answer

Cleaning old paintings

Answer

Surgeries

Answer

Manufacturing

Answer

Scientific research

Question 7

When white light travels through a prism, what causes it to split into a rainbow of colors?

Accepted Answer

The prism slows down light waves, making them bend and spread out.

Answer

The prism reflects all colors except red, creating a rainbow.

Answer

The prism absorbs some colors and reflects or transmits others, forming a rainbow.

Question 8

Which scientist made significant discoveries about lenses and their use in optical instruments?

Accepted Answer

Isaac Newton

Answer

Albert Einstein

Answer

Marie Curie

Answer

Thomas Edison

Question 9

What is a unique advantage of using a convex lens compared to a concave lens?

Accepted Answer

Convex lenses can focus light to a point, forming an image.

Answer

Convex lenses can correct nearsightedness.

Answer

Convex lenses are thicker at the edges than in the middle.

Answer

Convex lenses can reduce the size of objects.

Question 10

Why are some people concerned about the use of advanced optical technologies, like facial recognition systems and surveillance cameras, in public spaces?

Accepted Answer

These technologies could track people's movements and activities without their knowledge or consent.

Accepted Answer

They could be used to discriminate against certain groups of people, like people of color or religious minorities.

Accepted Answer

They could invade people's privacy by collecting data about their personal lives.

Question 11

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

Accepted Answer

The speed of light is different in air and glass.

Answer

The light ray travels in a straight line through the glass.

Answer

The angle of the light ray is the same before and after entering the glass.

Answer

The glass is transparent.

Question 12

Which of the following is NOT a natural source of light?

Accepted Answer

Lamp

Answer

Sun

Answer

Stars

Answer

Moon

Question 13

Which type of lens causes light rays to come together?

Accepted Answer

Convex lens

Answer

Concave lens

Answer

Flat lens

Answer

Prismatic lens

Question 14

Light travels in a straight line unless it hits an object. Which of the following is NOT a property of light?

Accepted Answer

Has mass

Answer

Can travel through transparent objects

Answer

Can be reflected off shiny surfaces

Answer

Can be absorbed by dark-colored objects

Question 15

Which of these materials is the best reflector of light?

Accepted Answer

Mirror

Answer

Glass

Answer

Water

Answer

Wood

Question 16

When light travels from air into water, what happens to its speed?

Accepted Answer

It decreases

Answer

It increases

Answer

It stays the same

Answer

It depends on the angle of the light

Question 17

How is a shadow created?

Accepted Answer

When light is blocked by an object

Answer

When light is reflected by an object

Answer

When light is refracted by an object

Answer

When light is absorbed by an object

Question 18

What type of lens is used in a magnifying glass?

Accepted Answer

Convex lens

Answer

Concave lens

Answer

Prism

Answer

Mirror

Question 19

Which of these is NOT an optical instrument?

Accepted Answer

Microphone

Answer

Camera

Answer

Telescope

Answer

Microscope

Question 20

Which color of light has the longest wavelength?

Accepted Answer

Red

Answer

Green

Answer

Blue

Answer

Violet

Question 21

Which of these allows light to pass through it clearly?

Accepted Answer

Glass

Answer

Wood

Answer

Metal

Answer

Paper

Question 22

When light moves from air into water, does it travel faster or slower?

Accepted Answer

Slower

Answer

Faster

Answer

At the same speed

Answer

It changes direction

Question 23

Which lens makes objects look smaller?

Accepted Answer

Concave lens

Answer

Convex lens

Answer

Magnifying glass

Answer

Microscope

Question 24

What is a prism used for?

Accepted Answer

To split white light into colours

Answer

To magnify objects

Answer

To reflect light

Answer

To focus light

Question 25

Which of the following is NOT a property of light?

Accepted Answer

Has weight

Answer

Travels in straight lines

Answer

Can be reflected

Answer

Can be refracted

Question 26

What is the dark area behind an object when light shines on it called?

Accepted Answer

Shadow

Answer

Reflection

Answer

Refraction

Answer

Mirage

Question 27

What happens when light hits a shiny surface?

Accepted Answer

It bounces off

Answer

It is absorbed

Answer

It passes through

Answer

It changes colour

Question 28

Which of the following materials allows you to see through it clearly?

Accepted Answer

Plastic wrap

Answer

Paper

Answer

Metal

Answer

Wood

Question 29

Which of these can make light bounce off it?

Accepted Answer

A mirror

Answer

A window

Answer

A prism

Answer

A magnifying glass

Question 30

Which of these is NOT a property of light?

Accepted Answer

It has weight.

Answer

It travels in a straight line.

Answer

It can be reflected.

Answer

It can bend around objects.

Question 31

What happens when light bends?

Accepted Answer

Refraction

Answer

Reflection

Answer

Absorption

Answer

Scattering

Question 32

What does a prism do to white light?

Accepted Answer

Splits it into seven colours

Answer

Splits it into two colours

Answer

Splits it into three colours

Answer

Splits it into five colours

Question 33

Which of these materials would be best for reflecting light?

Accepted Answer

Copper

Answer

Black paint

Answer

White paint

Answer

Glass

Question 34

What occurs when light hits a mirror?

Accepted Answer

It is reflected.

Answer

It is absorbed.

Answer

It is refracted.

Answer

It is scattered.

Question 35

Which of these is NOT a source of light?

Accepted Answer

The Moon

Answer

The Sun

Answer

A light bulb

Answer

A campfire

Question 36

Which of these materials can bend light?

Accepted Answer

Glass

Answer

Metal

Answer

Rubber

Answer

Wood

Question 37

Which colour of light has the longest wavelength?

Accepted Answer

Red

Answer

Blue

Answer

Green

Answer

Yellow

Question 38

What is the name of the effect that makes light bend when it passes from one substance to another?

Accepted Answer

Refraction

Answer

Reflection

Answer

Diffraction

Answer

Scattering

Question 39

Which material allows light to pass through it clearly, letting you see objects through it?

Accepted Answer

Glass

Answer

Wood

Answer

Metal

Answer

Brick

Question 40

When light strikes a mirror, what happens to it?

Accepted Answer

It is reflected

Answer

It is absorbed

Answer

It is refracted

Answer

It is scattered

Question 41

Which of these examples shows refraction of light?

Accepted Answer

A straw in a glass of water appearing bent

Answer

A shadow forming behind an object in sunlight

Answer

Light bouncing off a mirror

Answer

A rainbow appearing in the sky

Question 42

What do we call the device used to focus light?

Accepted Answer

Lens

Answer

Prism

Answer

Microscope

Answer

Telescope

Question 43

In a shadow, which part is the darkest?

Accepted Answer

Umbra

Answer

Penumbra

Answer

Antumbra

Answer

Core

Question 44

Which colour of light has the longest wavelength?

Accepted Answer

Red

Answer

Green

Answer

Blue

Answer

Violet

Question 45

When light passes from one material to another and changes direction, what is this phenomenon called?

Accepted Answer

Refraction

Answer

Reflection

Answer

Dispersion

Answer

Absorption

Question 46

What is the process by which plants use light to create their own food called?

Accepted Answer

Photosynthesis

Answer

Respiration

Answer

Transpiration

Answer

Osmosis

Question 47

How do lenses enhance our vision?

Accepted Answer

They magnify objects, making them appear larger.

Accepted Answer

They enable us to see distant objects more clearly.

Answer

They shield our eyes from sunlight.

Answer

They alter the colors of objects.

Question 48

Which object lets light pass through it clearly, without spreading it out?

Accepted Answer

A window made of glass

Answer

A piece of wood

Answer

A metal sheet

Answer

A sheet of paper

Question 49

How is a shadow made?

Accepted Answer

Light is blocked by an object

Answer

There is no light

Answer

The object is see-through

Answer

The object is shiny

Question 50

When light changes direction as it moves from one material to another, what is this called?

Accepted Answer

Refraction

Answer

Reflection

Answer

Diffraction

Answer

Absorption

Question 51

Which of these is NOT a source of light?

Accepted Answer

The Moon

Answer

The Sun

Answer

A lightbulb

Answer

A fire

Question 52

How does a magnifying glass make objects appear larger?

Accepted Answer

It bends the light rays that pass through it.

Answer

It reflects the light rays that hit it.

Answer

It absorbs the light rays that pass through it.

Question 53

Which of these tools cannot help us see more clearly?

Accepted Answer

Flashlight

Answer

Magnifying glass

Answer

Telescope

Answer

Glasses

Question 54

Who is credited with inventing the first practical telescope in 1609?

Accepted Answer

Galileo Galilei

Answer

Isaac Newton

Answer

Albert Einstein

Answer

James Clerk Maxwell

Question 55

Which of the following objects best demonstrates a transparent material?

Accepted Answer

Glass

Answer

Wood

Answer

Metal

Answer

Paper

Question 56

What happens to light as it moves from one substance to another?

Accepted Answer

Both of the above

Answer

Its speed changes.

Answer

Its direction changes.

Answer

Neither of the above

Question 57

Which of these is NOT a known type of lens?

Accepted Answer

Bifocal

Answer

Convex

Answer

Concave

Answer

Plano

Question 58

What is the primary function of a convex lens?

Accepted Answer

Increasing the size of objects

Answer

Reducing the size of objects

Answer

Correcting nearsightedness

Answer

Correcting farsightedness

Question 59

Which of the following materials allows light to pass through it clearly?

Accepted Answer

Glass

Answer

Wood

Answer

Cardboard

Answer

Metal

Question 60

When light bounces off a flat surface, what happens to it?

Accepted Answer

It reflects at the same angle as it hits the surface.

Answer

It bends as it passes through the surface.

Answer

It changes color.

Answer

It is absorbed by the surface.

Question 61

Which type of mirror can create an image that appears behind the mirror?

Accepted Answer

Concave mirror

Answer

Lens

Answer

Plane mirror

Answer

Convex mirror

Question 62

What is the purpose of a lens that causes light rays to come together?

Accepted Answer

To focus light rays to a single point.

Answer

To change the color of light.

Answer

To spread light rays apart.

Answer

To block light.

Question 63

Which color of light bends the most when passing from air into glass?

Accepted Answer

Violet

Answer

Green

Answer

Red

Answer

Yellow

Question 64

What is the angle between a light ray and a surface when the light ray strikes the surface straight on?

Accepted Answer

0 degrees

Answer

45 degrees

Answer

90 degrees

Answer

30 degrees