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GCSE Physics > GCSE-Light > Flashcards

GCSE-Light Flashcards

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1
Q

Total Internal Reflection happens only if the angle of incidence is greater than the…?

A

critical angle

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2
Q

Total Internal Reflection occurs at the…?… between two materials

A

boundary

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3
Q

The colour deviated least when white light is dispersed by a prism

A

Red

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4
Q

Object position for a camera lens

A

Beyond 2F

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5
Q

Image position for a camera lens

A

Between F and 2F

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6
Q

Object position for a magnifying glass

A

Between F and C

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7
Q

The nature of an image formed by a magnifying glass

A

virtual

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8
Q

Is the image formed by a magnifying glass erect or inverted?

A

erect

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9
Q

The image formed by a magnifying glass is …?… than the object.

A

larger

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10
Q

The …?… comes between the image formed by a magnifying glass and the magnifying glass itself.

A

object

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11
Q

Total internal Reflection cannot happen if the light is travelling into a …?… dense material

A

more

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12
Q

The angle of incidence …?… the angle of reflection

A

equals

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13
Q

Light entering a more dense material will bend …?… the normal

A

towards

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14
Q

Light entering a …?… dense material will bend away from the normal

A

less

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15
Q

The Law of Reflection says that the angle of incidence …?… the angle of reflection.

A

equals

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16
Q

The nature of the image formed by a plane mirror

A

virtual

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17
Q

The line joining an object and its image in a plane mirror is …?… to the mirror

A

perpendicular

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18
Q

The distance from an object to a plane mirror is …?… …?… the distance from its image to the plane mirror.

A

equal to

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19
Q

The colour deviated most when white light is dispersed by a prism

A

violet

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20
Q

Is the image formed by a camera lens real or virtual?

A

real

21
Q

Is the image formed by a camera lens upright or inverted?

A

inverted

22
Q

Is the image formed by a camera lens larger or smaller than the object?

A

smaller

23
Q

Is the image formed by a camera lens laterally inverted?

A

yes

24
Q

When light travelling from a more dense to a less dense material is incident at the critical angle, the angle of refraction is…?

A

90 degrees

25
Q

What angles are needed in a triangular prism to turn a light ray through 90 or 180 degrees?

A

90, 45, 45 degrees

26
Q

In which part of an optical fibre-the core or the cladding-would light travel more slowly?

A

Core

27
Q

How is a light ray trapped inside the core of an optical fibre?

A

Its angle of incidence at the core-cladding boundary is greater than the critical angle.

28
Q

When a light ray, not travelling along the normal, enters a new material in which it travels more slowly, it will …?

A

bend towards the normal.

29
Q

When a light ray, not travelling along the normal, enters a new material in which it travels more quickly, it will …?

A

bend away from the normal.

30
Q

Why does a triangular prism disperse white light into all the colours of the rainbow?

A

Each different colour slows down by a different amount when it enters the prism, so each colour will bend through a different angle.

31
Q

Is the image in a plane mirror laterally inverted?

A

Yes

32
Q

How does the size of the image in a plane mirror compare with the size of the object?

A

They are the same.

33
Q

Object position for a projector lens

A

Between F and 2F

34
Q

Image position for a projector lens

A

Beyond 2F

35
Q

Is the image formed by a projector lens real or virtual?

A

Real

36
Q

Is the image formed by a projector lens larger or smaller than the object?

A

Larger

37
Q

Is the image formed by a projector lens erect or inverted?

A

Inverted

38
Q

Is the image formed by a projector lens laterally inverted?

A

Yes

39
Q

What causes a person to be short-sighted?

A

The eyeball is too long for the power of the lens (or the lens is too powerful for the length of the eyeball).

40
Q

In a short-sighted eye, where is light from a distant object brought to a focus?

A

In front of the retina.

41
Q

What kind of spectacle lens is needed to correct short-sightedness?

A

Diverging (Concave).

42
Q

What causes a person to be long-sighted?

A

The eyeball is too short for the power of the lens (or the lens is not powerful enough for the length of the eyeball).

43
Q

In a long-sighted eye, where is light from a nearby object brought to a focus?

A

Behind the retina.

44
Q

What kind of spectacle lens is needed to correct long-sightedness?

A

Converging (Convex).

45
Q

When a light-ray travelling parallel to the principal axis passes through a converging lens, it emerges…?

A

travelling towards and then through the principal focus.

46
Q

When a light-ray travelling through the principal focus passes through a converging lens, it emerges…?

A

travelling parallel to the principal axis.

47
Q

When a light-ray travelling through the optical centre passes through a converging lens, it emerges…?

A

without changing direction.

48
Q

Define what is meant by the focal length of a lens.

A

It is the distance from the optical centre of the lens to the principal focus measured along the principal axis.

49
Q

What happens to the speed of light when it enters a more dense material?

A

It slows down.

GCSE Physics (11 decks)

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