Question

Draw the diagram for a case where a light ray does not deviate, when fallen on a curved surface separating two media?

Answer 1

When a ray is incident perpendicularly to the surface then there is no deviation .

Explanation :

• When a light ray is incident on the the plane perpendicularly then the deviation due to refraction is zero .
• For a given curved surface the area of radius of curvature is R.
• Now if a light ray comes along the radius i.e. the radial direction then it will be perpendicular to the curved surface .

Hence , for a curved surface separating two media of refractive indices $n_1$ and $n_2$ , the case of zero deviation is shown in the attached fig .