In refraction of light through a prism, the light ray:

1. suffers refraction only at one face of the prism
2. emerges out from the prism in a direction parallel to the incident ray
3. bends at both the surfaces of the prism towards its base
4. bends at both the surfaces of prism opposite to its base.

In the figure given ahead the correct statement is:

1. ABED and ABC are the refracting surfaces.
2. line AD is the refracting edge
3. angle a is the angle of deviation
4. AB is the base of the prism.

The angle of deviation becomes minimum when:

1. i₁ = r₁
2. i₁ = r₂
3. i₁ = i₂
4. r₂ = i₂

In position of minimum deviation, the refracted ray inside the prism is …………… to its base:

1. normal
2. inclined at 45°
3. parallel
4. none of the above