Question

Dispersion of white light by a glass prism establishes that the white light is a

mixture of seven colours. Every colour has its own characteristic wavelength.

Wavelength of different colours are given in the table.

Colour Wavelength

Violet 380-450 nm

Blue 450-495 nm

Green 495-570 nm

Yellow 570-590 nm

Orange 590-620 nm

Red 620-750 nm

i) Which colour suffers least deviation on passing through a prism?

a) Red b) Violet

c) Indigo d) Blue

ii) For which colour, refractive index of glass is maximum?

a) Red b) Violet

c) Green d) Yellow

iii) Which of the following statements is correct regarding the propagation of

light of different colours of white light in air?

a) Red light travels faster.

b) Blue light moves faster than green light.

c) All the colours of white light move with the same speed

d) Yellow light moves with the mean speed as that of the red and

violet light.

iv) Rainbow is formed due to

a) internal reflection and dispersion of light through a water droplet.

b) refraction, internal reflection and dispersion of light through water

droplet.

c) only dispersion of light.

d) only refraction of light.

v) Which of the following colour of white light has the least speed in glass

prism?

a) violet b) yellow

c) red d) green​

Answer 1

Answer:

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Answer 2

Answer:

v) voilet

The harbor is a turning point for the distributary of the Holy Ganges. The river Hooghly turns towards the south into the Bay of Bengal. Owing to this the river area gets deeper and wider. Thus the big ships comfortably dock at the Diamond harbor.