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Physics Year 10 > Light > Flashcards

Light Flashcards

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1
Q

What is light?

A

is a form of energy that enables us to see things.

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2
Q

Name some sources of luminous objects.

A

The sun,a bulb, a flame, a star

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3
Q

Give two examples of non-luminous objects.

A

A desk and a chair

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4
Q

How can we see things?

A

We can see things because they reflect or emit light coming from them.

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5
Q

What is meant by ‘light travels in straight lines’?

A

It means that when light comes from an object, it travels straight, which is called rectilinear propagation.

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6
Q

Give two examples where you can observe light traveling in straight lines.

A

When we see rays coming out from behind clouds,
When sunlight enters a room through ventilators.

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7
Q

How can we sometimes see beams of light?

A

We can sometimes see beams of light when there is dust or smoke because particles help us to see the path of light.

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8
Q

Explain how shadows are formed.

A

Shadows are formed when an opaque object blocks the path of light, causing a shadow to form on the opposite side of the object, away from the light source.

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9
Q

What do you mean by a beam of light?

A

A beam of light is a narrow set of light rays. A group of rays is called a beam or pencil beam.

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10
Q

What are some examples of reflecting surfaces?

A

A shiny stainless steel,a mirror ,windows, calm water etc

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11
Q

If there’s a mirror and a ray it’s coming towards that ray is called the______ ___. The reflected ray is called the ________ ___

A

Incident ray. Reflected ray

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12
Q

How is a mirror usually drawn?

A

With a straight line and lines

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13
Q

Mention instances where periscopes are used.

A

In a submarine and to watch a football match

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14
Q

Explain how periscopes work.

A

A periscopes is an optical instrument used to observe above a concealed place. It consists of a tube with mirrors set parallel to each other at a 45 degree angle. The mirrors reflect light from one to another and the observes can see.

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15
Q

What is the distance relationship between an object and its image in a plane mirror?

A

The distance from the object to the mirror is equal to the distance from the image to the mirror.

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16
Q

List three characteristics of the image formed by a plane mirror.

A

Three characteristics of the image formed by a plane mirror:
• The image is the same size as the object.
• The image is laterally inverted (left and right are reversed).
• The image is upright (erect).

17
Q

What type of image is formed by a plane mirror, and why is it called that?

A

The image formed by a plane mirror is a virtual image. It is called a virtual image because the rays of light do not actually meet but appear to come from behind the mirror.

18
Q

Explain why the image formed by a plane mirror appears to have depth.

A

The image appears to come from behind the plane surface of the mirror, giving the illusion of depth.

19
Q

What is the difference between a real image and a virtual image?

A

A real image is formed when rays of light actually meet at a point and can be projected onto a screen. A virtual image, on the other hand, is formed when rays of light appear to diverge from a point behind the mirror and cannot be projected onto a screen.

20
Q

What happens to light when it passes from air into glass?

A

When light passes from air into glass, it slows down and bends towards the normal.

21
Q

Define refraction.

A

Refraction is the bending of light as it passes from one transparent medium to another, changing its speed and direction.

22
Q

Why does refraction occur?

A

Refraction occurs because light changes speed when it moves from one medium to another with a different optical density.

23
Q

How does the speed of light change when it moves from air to a more optically dense medium like glass?

A

The speed of light decreases when it moves from air to a more optically dense medium like glass.

24
Q

What is the speed of light in air compared to its speed in glass?

A

The speed of light in air is approximately 300,000,000 meters per second, while in glass, it is about 200,000,000 meters per second.

25
Q

Which medium has the slowest speed of light among air, water, perspex, glass, and diamond?

A

Diamond has the slowest speed of light

26
Q

Why do swimming pools or buckets of water appear shallower than they really are?

A

Swimming pools or buckets of water appear shallower than they really are because of the refraction of light.

27
Q

What happens to light rays as they leave the water and enter the air?

A

light rays leave the water and enter the air, they are refracted away from the normal.

28
Q

How does the apparent depth compare to the real depth?

A

The apparent depth is less than the real depth.

29
Q

Why do objects under water appear to be at a higher point than they actually are?

A

Objects under water appear to be at a higher point than they actually are because the light rays are bent away from the normal, making them seem to come from a higher point.

30
Q

What is the effect of refraction on the perception of depth in water?

A

Refraction causes objects in water to appear closer to the surface than they actually are, making the water seem shallower.

31
Q

What is the angle of reflection if the angle of incidence is 20 degrees?

A

The angle of reflection is also 20 degrees.

32
Q

What is the relationship between the angle of incidence and the angle of reflection?

A

The angle of incidence is equal to the angle of reflection.

33
Q

What occurs when light enters glass at an angle of incidence of 0º?

A

It travels straight through and does not bend.

34
Q

How does light bend when it travels from air to glass?

A

Light is refracted (bent) towards the normal.

35
Q

What happens to the speed of light when it travels from a less optically dense medium to a more optically dense medium?

A

The speed of light decreases.

Physics Year 10 (5 decks)

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