Question

A thin lens made of a material of refractive index μ₂ has a medium of refractive index μ₁, on one side and a medium of refractive index μ₃, on the other side. The lens is biconvex and the two radii of curvature have equal magnitude R. A beam of light travelling parallel to the principal axis is incident on the lens. Where will the image be formed if the beam is incident from (a) the medium μ₁, and (b) from the medium μ₃ ?

Answer 1

a) When the beam is incident on the lens from medium μ₁.

b) Similarly for the beam from μ₃ medium the image is formed at