GCSE-Light

Question 1

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

Answer 1

critical angle

Question 2

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

Answer 2

boundary

Question 3

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

Answer 3

Red

Question 4

Object position for a camera lens

Answer 4

Beyond 2F

Question 5

Image position for a camera lens

Answer 5

Between F and 2F

Question 6

Object position for a magnifying glass

Answer 6

Between F and C

Question 7

The nature of an image formed by a magnifying glass

Answer 7

virtual

Question 8

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

Answer 8

erect

Question 9

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

Answer 9

larger

Question 10

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

Answer 10

object

Question 11

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

Answer 11

more

Question 12

The angle of incidence …?… the angle of reflection

Answer 12

equals

Question 13

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

Answer 13

towards

Question 14

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

Answer 14

less

Question 15

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

Answer 15

equals

Question 16

The nature of the image formed by a plane mirror

Answer 16

virtual

Question 17

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

Answer 17

perpendicular

Question 18

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

Answer 18

equal to

Question 19

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

Answer 19

violet

Question 20

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

Answer 20

real

Question 21

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

Answer 21

inverted

Question 22

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

Answer 22

smaller

Question 23

Is the image formed by a camera lens laterally inverted?

Answer 23

yes

Question 24

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

Answer 24

90 degrees

Question 25

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

Answer 25

90, 45, 45 degrees

Question 26

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

Answer 26

Core

Question 27

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

Answer 27

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

Question 28

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

Answer 28

bend towards the normal.

Question 29

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

Answer 29

bend away from the normal.

Question 30

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

Answer 30

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

Question 31

Is the image in a plane mirror laterally inverted?

Answer 31

Yes

Question 32

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

Answer 32

They are the same.

Question 33

Object position for a projector lens

Answer 33

Between F and 2F

Question 34

Image position for a projector lens

Answer 34

Beyond 2F

Question 35

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

Answer 35

Real

Question 36

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

Answer 36

Larger

Question 37

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

Answer 37

Inverted

Question 38

Is the image formed by a projector lens laterally inverted?

Answer 38

Yes

Question 39

What causes a person to be short-sighted?

Answer 39

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

Question 40

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

Answer 40

In front of the retina.

Question 41

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

Answer 41

Diverging (Concave).

Question 42

What causes a person to be long-sighted?

Answer 42

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

Question 43

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

Answer 43

Behind the retina.

Question 44

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

Answer 44

Converging (Convex).

Question 45

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

Answer 45

travelling towards and then through the principal focus.

Question 46

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

Answer 46

travelling parallel to the principal axis.

Question 47

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

Answer 47

without changing direction.

Question 48

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

Answer 48

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

Question 49

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

Answer 49

It slows down.