Question

# 1. Parallel light rays in air strike the surface of glass (n = 1.5) at an...

1. Parallel light rays in air strike the surface of glass (n = 1.5) at an angle of incidence of 26o. Some of the rays are reflected and some are refracted. What is the angle between reflected and refracted rays?

2. A green laser (wavelength 545 nm) is shone from air to water. Which of the following statements is true for the wavelength and frequency of the laser light?

A. The wavelength will decrease but the frequency will remain the same.

B. The wavelength will remain the same but the frequency will decrease.

C. The wavelength will increase and its frequency will decrease.

D. The wavelength will decrease and its frequency will increase.

When light travels from rarer medium to glass medium its wavelength decreases due to more refractive index of a medium.

The refractive index of a medium is inversely proportional to wavelength of light travelling.

When light travels from one medium to another medium its frequency is a reminds a constant. It can be justify like the number of waves per second incident is equal to the number of waves per second refracting.