Dispersion of White Light

Q. Explain the phenomenon of dispersion of white light through a glass prism, using suitable ray diagram. [3 Marks]

Q.

Rainbow is caused due to:

1. Reflection of sun light in air

2. Multiple reflections of sunlight from water drops

3. Refraction of sun rays from water drops

4. Dispersion of sun light from water drops

Q.

Which of following statement(s) is/are true with respect to a prism if 'i' is the incident light ray and the dotted line shows the normal to the point where light strikes?

1. It bends light falling on it towards its base

2. It bends lights of different colors by same amount

3. It creates colors of its own

4. All of these

Q.

While playing with prisms, Sushweta arranged three prisms as shown below ($2^{nd}$ prism inverted with respect to the other two) and made sunlight fall on the $1^{st}$ prism.

The colour(s) she would observe in regions A, B and C are respectively:

1. Band of 7 colors, Band of 7 colors, Band of 7 colors

2. Band of 7 colors, White light, Band of 7 colors

3. Band of 7 colors, Band of 7 colors, White light

4. White light, Band of 7 colors, White light

Q.

What colour of light is obtained when we combine the seven colours of a rainbow?

1. White

2. Blue

3. Green

4. Black

Q.

When light rays are passed through a prism, the phenomenon that occurs is known as ___________ of light.

1. dispersion

2. scattering

3. reflection

4. diffraction

Q.

The phenomenon of the splitting up of white light into its component colours is called ___.

1. reflection

2. refraction

3. dispersion

4. absorption

Q.

Blue light is made to fall on a prism. What color would you observe on the other side of the prism?

1. Band of 7 colors

2. Blue light

3. White light

4. Can’t say

Q.

Dispersion of white light occurs because different colours of white light undergo different extents of refraction. The dispersion is not evident in a glass slab like it is evident in a prism because the two refracting surfaces are parallel to each other.

1. True

2. False

Q. When white light is passed through a prism it splits into colours.

1. seven
2. three
3. one
4. eight