A boy uses blue colour of light to find the refractive index of glass. He then repeats the experiment using red colour of light. Will the refractive index be the same or different in the two cases? Give a reason to support your answer.

Name the constituent colour of white light for which the refractive index of glass is maximum.

The refractive index of glass is 1.5. Find the speed of light in glass.

How does the refractive index of a medium depend on the wavelength of light used ?

(a) For which colour of white light, is the refractive index of a transparent medium (i) the least, (ii) the most ? (b) Which colour of light travels fastest in any medium except air ?

An experment is performed to find the refractive index of glass using a travelling mircroscope. In this experiment distances are measured by

Give reason Red, blue, and green are called primary colours of light.

If the refractive index of glass is 1.5. Find the velocity of light in glass. (Velocity of light in vacuum = 3 xx 10^(8) m//s )

A boy uses a single fixed pulley to lift a load of 50 kgf to some height. Another boy uses a single movable pulley to lift the same load to the same height. Compare the effort applied by them. Give a reason to support your answer.

The diagram below shows two parallel rays A and B of red and violet light respectively incident from air on air-glass boundary. Complete the diagram showing the refracted rays for them in the glass. (i) How do the speeds of the rays differ in glass ? (ii) are the two refracted rays in glass parallel ? Give a reason for your answer. (iii) How does the refractive index of glass differ for the two rays ?

A glass slab consists of thin uniform layers of progressively decreasing refractive indices refractive index such that the refractive index of any layer is mu-mDeltamu . Here mu and Deltamu denotes the refractive index of 0th layer and the difference in refractive index betweeen any two consecutive layers, resepctively. The integer m=0,1,2,3 ... denotes the number of the suscessive layers. A ray of light from the 0th layers enters the 1st layer at an angle of incidence of 30^(@) . After undergoing the mth refraction, the ray emerges paralllel to the interaface. If mu=1.5 and Deltamu=0.015 , then the value of m is