Question

What is the difference in a deviation between any two colors called?

(a) Linear dispersion

(b) Angular dispersion

(c) Mean deviation

(d) Mean dispersion

The question was asked in an online interview.

Query is from Ray Optics in chapter Ray Optics and Optical Instruments of Physics – Class 12

Answer 1

Right answer is (b) Angular dispersion

To explain I would say: The difference in a deviation between any two colors is known as angular dispersion. Angular dispersion is given as:

δV-δR=(μV-μR)A

Where μV and μR are the refractive index for violet rays and red rays, respectively. Mean deviation is δ = \( ( \frac {\delta_V + \delta_R}{2} ) \).