Question

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

Answer 1

Answer:

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Answer: If the incident ray follows the normal drawn perpendicularly on the junction plane of 2 mediums, it will not refract. Angle of refraction (angle between the refracted ray and the normal), 'r' also becomes 0 thus no change in direction occurs.

Answer 2

Answer:

C is the answer

Explanation:

Because this why different refractive will change direction of light