Question

A glass slab is placed over a page on which the word vibgyor is printed wit!, each letter in its corresponding colour. 

(a) Will the image of all the letters be in the same place? 

(b) If not, which letter will be raised to the maximum. Give a reason for your answer. 

Answer 1

(a) No, the image of all letters will not be at the same place. 

(b) Letter V will be raised maximum. This is because the refractive index of a material depends inversely upon the wavelength of light. On the other hand the shift in the image depends directly on the refractive index. Since the refractive index of a material is maximum for violet light, therefore letter V which is written with violet colour is raised the maximum.