Refraction of Light

The diagram shows two rays of light entering a glass block.

Which equation is correct?
1. w / x = y / z
2. sin w / sin x = sin y / sin z
3. w X x = y X z
4. sin w X sin x = sin y X sin z
The diagram shows a ray of light entering a glass block of refractive index 1.41 at an angle of incidence 45^o

By how many degrees does the light ray change direction when entering the glass?
1. 15
2. 30
3. 45
4. 90
The diagram shows the path of a ray of light travelling towards and into the a pool of water. Four angles are labelled.

Which two angles would be correctly used in the equation sin i/ sin r = constant?
1. P and R
2. P and S
3. Q and R
4. Q and S
Which diagram shows what happens to a ray of light when it passes from air into a block of glass?
1. A
2. B
3. C
4. D
The table shows two sets of measurements taken during an experiment in which rays of light are shone at one of the sides of a rectangular block of glass.
angle of incidence, i 26.0^o 39.0^o
angle of refraction, r 15.5^o 22.5^o
sin i 0.438 0.629
sin r 0.267 0.383

What is the refractive index of the glass?
1. 1.50
2. 1.64
3. 1.68
4. 1.73
The bottom surface of a glass block is silvered to act as a mirror.

Which diagram could represent the path of a light ray which enters this block through the top surface?
1. A
2. B
3. C
4. D
A ray of light travels from air into glass. The angle of incidence is i and the angle of refraction is r.
Which expression is used to calculate the refractive index?
1. i / r
2. sin i / sin r
3. sin (i / r)
4. sin i x sin r
The diagram shows a ray of light moving from air into plastic.

What is the refractive index of the plastic?
1. 0.71
2. 1.22
3. 1.41
4. 1.50
What affects the refractive index of a sample of glass?
1. The angle of incidence
2. The shape of the glass
3. The thickness of the glass
4. The type of glass
A ray of light travels from air into a glass block.
Which diagram correctly shows the path of the ray of light through a glass block?
1. A
2. B
3. C
4. D
A ray of light passes from water to air.

Which arrows shows the direction of the ray in the air?
1. A
2. B
3. C
4. D
Which line shows the path a ray of light would take through a glass block?
1. A
2. B
3. C
4. D
Below are diagrams of different shapes and sizes of glasses with a ray of light passing through them from air.

Which one of the following diagram is not possible?
1. A
2. B
3. C
4. D
An observer looks straight through a rectangular glass block at an object P, as shown below.

How does the object appear to the observer?`
1. Moved to the right
2. In its true position
3. Diminished
4. Nearer
Below is a diagram that shows a ray of light travelling through 3 substances : air,glass and water (necessarily in that order).

Given that the velocity of light is fastest in the air and slowest in glass, what is the correct order of the three substances?
1. 1 Glass; 2 Water; 3 Air
2. 1 Air; 2 Glass; 3 Water
3. 1 Glass; 2 Air; 3 Water
4. 1 Air; 2 Water; 3 Glass
When viewed normally, a rectangular block of glass appears to be 0.5 cm thick.

If the refractive index of the glass is 1.5, find the true thickness of the block?
1. 7.5 cm
2. 2.5 cm
3. 6.5 cm
4. 3.3 cm
The diagram below shows a ray of light, PQ, incidence on a rectangular glass block.

Which one of the following rays, A - D, is the path ray emerging from the block after refraction?
1. A
2. B
3. C
4. D
X is a ray of light entering water.

Which one of the ray in the diagram is the refracted ray?
1. A
2. B
3. C
4. D
In which diagram is the path of the light ray not correct?
A ray of light passes into a parallel-sided glass block of refractive index 1.5.

What is the value of the angle marked X?
1. 19.5^o
2. 25^o
3. 35^o
4. 48.5^o

angle of incidence, i	26.0^o	39.0^o
angle of refraction, r	15.5^o	22.5^o
sin i	0.438	0.629
sin r	0.267	0.383

Refraction of Light

Multiple Choice Questions