In Fig. 35-50a, the waves along rays 1 and 2 are initially in phase, with the sa
ID: 1981378 • Letter: I
Question
In Fig. 35-50a, the waves along rays 1 and 2 are initially in phase, with the same wavelength A in air. Ray 2 goes through e material with length Land index of refraction n. The rays are then reflected by mirrors to a common point P on a screen. Suppose that we can vary n from n = 1.0 ton= 2.9. Suppose also that, from n = 1.0 ton= ns = 1.45, the intensity I of the light at point P varies with n as given in . 35-SOb. At what values of n greater than 1.36 is intensity I What multiple of lambda gives the phase difference between the rays at point P when n = 1.90?Explanation / Answer
The phase difference should be multiples of by the factor
L(n2-n1) = (L)(1.9-1.0)
= 0.9L