Question

In the spectrum of white light by a prism, the colour at the extreme end opposite to the base of prism is:

(a) violet

(b) yellow

(c) red

(d) blue

Answer 1

The colour of the extreme end opposite to the base of the prism is red.

Hint: The angle of deviation decreases with the increase in wavelength of light for a given angle of incidence. Since the red light has greatest wavelength, it gets deviated the least and is seen on the extreme end opposite to the base of prism.