3. Two in phase, monochromatic light rays traverse transparent materials with differing indices of refraction but a common length. The wavelength of the light is 1 =450. nm . Far from the materials the light rays are combined without further phase shifts and there is interference. a. If n, =1.500 n, =1.575 and L=15.0µm what is the phase difference in wavelengths ( N, - N, )? b. If n, =1.425 n, =1.575 and L=15.0µm what is the phase difference in wavelengths ( N, - N,)? c. If n, =1.425 n =1.575 and L=10.5µm what is the phase difference in wavelengths ( N, - N, )? d. Rank the three cases above, a, b, and c, in terms of brightness for the combined light (from brightest to dimmest, use "=" to indicate if two or more are equal in brightness).

3. Two in phase, monochromatic light rays traverse transparent materials with differing indices of refraction but a common length. The wavelength of the light is 1 =450. nm . Far from the materials the light rays are combined without further phase shifts and there is interference. a. If n, =1.500 n, =1.575 and L=15.0µm what is the phase difference in wavelengths ( N, - N, )? b. If n, =1.425 n, =1.575 and L=15.0µm what is the phase difference in wavelengths ( N, - N,)? c. If n, =1.425 n =1.575 and L=10.5µm what is the phase difference in wavelengths ( N, - N, )? d. Rank the three cases above, a, b, and c, in terms of brightness for the combined light (from brightest to dimmest, use "=" to indicate if two or more are equal in brightness).