A ray moving through glass (n = 1.51) passes into acetone (n = 1.36). How much does its velocity change?

Change in velocity = 0.219 * 10⁸ m/s (Approx)

Explanation:

Given:

Ray moving through glass (n1) = 1.51

Ray moving through (n2) = 1.36

Find:

Change in velocity.

Computation:

Speed of light = 3 * 10⁸

Change in velocity = [ (c/n2) - (c/n1) ]

Change in velocity = [ (c/n1) - (c/n1) ]

Change in velocity = 3 * 10⁸[ (1/1.36) - (1/1.51) ]

Change in velocity = 3 * 10⁸[0.7352-0.6622]

Change in velocity = 3 * 10⁸[0.073]

Change in velocity = 0.219 * 10⁸ m/s (Approx)