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

Speed of light in vacuum is 3 x 10⁸ m/s. Its speed in water will be :

[Given refractive index of water is 4/3]

1. 3 x 10⁸ m/s
2. 2.25 x 10⁸ m/s
3. 2.5 x 10⁸ m/s
4. 4 x 10⁸ m/s

The highest refractive index is of:

1. glass
2. water
3. diamond
4. Ruby

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.