Prism

Q.

What is the order of the seven colours (from most deviated to least deviated) that we see after dispersion through a glass prism?

1. Violet, indigo, red, green, blue, orange, yellow

2. Red, yellow, indigo, blue, violet, green, orange

3. Violet, indigo, blue, green, yellow, orange, red

4. Red, orange, yellow, violet, indigo, blue, green

Q. The angle of deviation for a prism is greatest for?

1. Red colour
2. Violet colour
3. Blue colour
4. Green colour

Q. A ray of light passes from medium 1 to medium 2. In medium 1, it strikes at an angle of 15° from the normal. Whereas in medium 2, it makes an angle of 30° from the normal after the refraction. Which medium is a denser medium?

1. Insufficient data
2. Medium 1
3. Medium 2
4. Both mediums are equally dense

Q.

During dispersion of white light by prism placed in air,

1. only angular spread takes place

2. only angular deviation takes place

3. either angular spread or angular deviation for the mean colour takes place depending on the angle of the prism

4. both angular deviation and angular spread take place

Q. Arrange the following colours in the ascending order of their deviation through a prism.

1. Red
2. Yellow
3. Green
4. Blue
5. Violet

Q. During the dispersion of white light by a prism, which of the following colours deviate second least?

[0.8 mark]

1. Orange
2. Violet
3. Red
4. Indigo

Q. A ray of light falls on one of the lateral surface of an equilateral glass prism placed on the horizontal surface of a table as shown in fig. 2.For minimum deviation of ray, which of the following is true?

1. either PQ or RS is horizontal
2. QR is horizontal
3. RS is horizontal
4. PQ is horizontal

Q.

Light rays get refracted ______ when they pass from air to glass prism.

1. towards the normal

2. away from the normal

3. along the normal

4. along the air-glass interface

Q. Match the correct pairs.

1. Prism
2. Mirage
3. Blue sky
4. Refraction
5. Scattering
6. Dispersion

Q. Arrange the following colours in ascending order of their deviation through the prism.

1. Red
2. Green
3. Blue
4. Yellow
5. Violet

Q. What will happen if we keep a glass prism inside water instead of air and pass white light through it?

1. White light will pass it without splitting.
2. The angle of deviation of each splitted ray will increase.
3. The angle deviation of each splitted ray will decrease.
4. Splitted red light will bend more than the splitted blue light.

Q. Arrange the following colours in ascending order of their deviation through the prism.

1. Red
2. Green
3. Blue
4. Yellow
5. Violet

Q. The angle of deviation for a prism is greatest for?

1. Red colour
2. Violet colour
3. Blue colour
4. Green colour

Q. The correct diagram to show the refraction of light from air to glass is:

1. 

2. 

3. 

4. 

Q.

The following diagrams show the splitting up of a composite light into its constituent colours.

Which among the above figures is correct?

1. (ii)

2. (iii)

3. (i)

4. both (iii) and (i)

Q.

A light ray enters a rectangular glass slab from air. At the first surface of refraction, $i$ is the angle of incidence and $r$ is the angle of refraction. Which of the following statements is correct?

1. $r=i$

2. $r<i$

3. $r>i$

4. Cannot be determined

Q. After being dispersed from a prism, white light splits into seven colours. Which colour will be refracted the most?

1. Red
2. Green
3. Blue
4. Violet

Q. As the density of a medium increases, its refractive index ___.

1. increases
2. decreases
3. remains same
4. either increases or decreases

Q. Arrange the following colors in ascending order of their deviation through prism.

1. Red
2. Green
3. Blue
4. Yellow
5. Violet