Question

Half the surface of the transparent sphere of refractive index 2 is silvered. A narrow, parallel beam of light is incident on the unsilveredsurface, symmetrically with respect to the silvered part.The light finally emerging from the sphere will be a
a) PARALLEL BEAM
b) CONVERGING BEAM
c) SLIGHTLY DIVERGENT BEAM
D) WIDELY DIVERGENT BEAM

Answer 1

• When half of the transparent sphere is silvered, then the silvered sphere behaves like a concave mirror.
• With the incident of light on polished surface of the concave mirror, the light rays gets reflected such that they focus at the focal length of the mirror.
• Hence, the emerging light beam is a converging beam of light.