When a ray of light passes from one optical medium to another, which of the following physical quantities does NOT change?

1. Amplitude of the wave
2. Frequency of the wave
3. Wavelength of the wave
4. Speed of the wave

Which one of the following combinations is the correct ascending order of electromagnetic waves in terms of wavelength?

1. Gamma-rays, visible light, microwaves
2. Microwaves, visible light, gamma-rays
3. Gamma-rays, microwaves, visible light
4. Microwaves, gamma-rays, visible light

For a real image formed by a convex lens, the ratio of I : O = 2 : 5, then the object is :

(I is the height of the image and O is the height of the object)

1. between O and F
2. beyond 2F
3. at F
4. between F and 2F

A ray of light is incident normally on a face of an equilateral prism. The ray gets totally reflected at the second refracting surface. The total deviation produced in the path of the ray is:

1. 30°
2. 60°
3. 90°
4. 120°