When light passes from a denser medium to a rarer medium, its wavelength :

1. decreases
2. increases
3. remains the same
4. none

Which of the following is correct when a ray of light passes from a rarer medium to a denser medium:

(1) speed will decrease
(2) frequency remains unchanged
(3) wavelength will decrease
(4) intensity will decrease

1. (1)
2. (1) and (4)
3. (1), (2) and (4)
4. all of the above

The optical density of turpentine is higher than that of water, while its mass density is lower than water. The figure given below shows a layer of turpentine floating over water taken in a container. For which one of the four rays incident on turpentine in the path shown in the figure is correct?

1. Ray 1
2. Ray 2
3. Ray 3
4. Ray 4

With respect to light passing from air into water, which of the following statements is correct?

1. Angle of incidence is equal to the angle of refraction.
2. Angle of incidence is always greater than the angle of refraction
3. Angle of incidence is always less than the angle of refraction
4. Angle of incidence has no effect on the angle of refraction.