If refractive indices of medium 1 and medium 2 are same, the speed of light will:

1. increase
2. decrease
3. remain the same
4. none

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

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