Question

Vy, VR, VG are the velocities of violet, red and
green light respectively, in a glass prism. Which
among the following is a correct relation ?
(A) Vy > VR > VG (B) Vy < VR < VG
(C) Vy < Vo <VR (D V = VR = VG​

Answer 1

Explanation ⇒    In VIBGYOR,  The Wavelength of Violet is less and wavelength decreases, and becomes maximum up to Red.

Thus, Violet light is deviated the most and the red light deviated the least. In the Spectrum, the deviation decreases from Violet to red.

As a result the Speed of different colors in VIBGYOR decreases from violet and becomes maximum at Red.

Thus, Vr is max. then, Vy and then Vg.

∴ Correct sequence will be,

Vg ∠ Vy ∠ Vr.

There is no such Options. But its the only correct answer. This means your question is little wrong.

Hope it helps.