Question

Tick () the correct option.

question: Which of the following conditions is not necessary for a change in the
direction of propagation when a light ray goes from one medium to another?
1.The light ray must be incident at an angle greater than 0° with respect to
the normal at its point of incidence.
2.The two media must both be transparent.
3.The two media must have different refractive indices.
4.The incident light rays must always have only the blue colour.​


plss help

Answer 1

Answer:

3.The two media must have different refractive indices.

Explanation

When a light wave pass from medium I to medium II, and continue in the same direction as a refracted ray, then it will make its own angle of refraction, which is the angle between the refracted ray and the normal line, in this case the refractive indices of both the mediums will be same so the light ray will not change its path from medium Ito medium II.