Parallel rays of light are falling on co...

Parallel rays of light are falling on convex sphere surface of radius of curvature R = 20 cm as show. Refractive index of the medium is `mu = 1.5`. A refraction from the spherical surface parallel rays

actually meet at some point

appear to meet after extending the refracted rays backwards

meet (or appear to meet) at a distance of 30 cm from the spherical surface

meet (or appear to meet) at a distance of 60 cm from the spherical surface.

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