Dispersion of White Light by Glass Prism

Q.

Define the term dispersion of light.

Q.

Why does red light refract the least?

Q. The coloured light having the maximum speed in glass prism is :
(a) blue (b) green (c) violet (d) yellow

Q.

Issac Newton was the first to obtain the spectrum of sunlight using a glass prism.

1. True

2. False

Q. Which is refracted most by a prism : red light or violet light ? Explain why ?

Q. Which of the following coloured light has the least speed in glass prism ?
(a) violet (b) yellow (c) red (d) green

Q.

Describe how you could demonstrate that white light is composed of a number of colours.

Q.

Write down the seven colours of the visible spectrum in order.

Q.

When a beam of white light is passed through a prism, it splits to form lights of seven colours. Is it possible to recombine the lights of seven colours to obtain the white light again ? Explain your answer.

Q.

(a) Draw a diagram to show the refraction of light through a glass prism. On this diagram, mark (i) incident ray (ii) emergent ray, and (iii) angle of deviation.
(b) What is a rainbow ? What are the two conditions necessary for the formation of arainbow in the sky ?
(c) What acts as tiny prisms in the formation of a rainbow ?
(d) Name the process which is involved in the formation of a rainbow.
(e) What are the seven colours seeen in a rainbow ?

Q. What is net deviation?

Q. Rainbow is a natural example of dispersion of light.

1. True
2. False

Q. The colour of white light which suffers the maximum bending (or maximum refraction) on passing through a glass prism is :
(a) yellow (b) orange (c) red (d) violet

Q. Which of the following colour of white light is least deviated by the prism ?
(a) green (b) violet (c) indigo (d) yellow

Q.

How could you show that the colours of the spectrum combine to give white light ?

Q.

Define color subtraction?

Q. The colour of white light which is deviated the maximum on passing through the glass prism is :
(a) blue (b) indigo (c) red (d) orange

Q.

What is rainbow? How is rainbow formed? [3 MARKS]

Q.

Name the extreme colors in a pure spectrum of light?

Q.

What does visible light consist of?

Q. A beam of white light falls on a glass prism. The colour of light which undergoes the least bending on passing through the glass prism is :
(a) violet (b) red (c) green (d) blue

Q. The splitting up of white light into seven colours on passing through a glass prism is called :
(a) refraction (b) deflection (c) dispersion (d) scattering

Q.

In the figure given alongside, a narrow beam of white light is shown to pass through a triangular glass prism. After passing through the prism, it produces a stectrum YX on the screen.
(a) State the colour seen (i ) at X, and (ii) at Y.
(b) Why do different colours of white light bend through different angles with respect to the incident beam of light ?

Q. What did Newton demonstrate by his experiments with the prism ?

Q. (a) What is spectrum ? What is the name of glass shape used to produce a spectrum ?
(b) How many colours are there in a full spectrum of white light ? Write the various colours of spectrum in the order. starting with red.

Q. Which light has the longer wavelength : red light or blue light ?

Q. The speed of light remains the same in all media.

1. True
2. False

Q. Define scattering of light and dispersion.

Q. (a) What happens when a ray of ordinary light is passed through a triangular glass prism ?
(b) What will happen if another similar glass prism is placed upside down behind the first prism ?

Q. Why do you not see a spectrum of colours when light passes through a flat pane of glass ?