Figure (18-Q2) shows two rays A and B being reflected by a mirror and going as A’ and B’. The mirror
We can see, the reflected rays are still parallel. We all know, spherical mirror will either converge or diverge the rays. Hence, it is only a plane mirror.
Figure (18-Q3) shows three transparent media of refractive indices μ1, μ2 and μ3. A point object O is placed in the medium μ2. If the entire medium on the right of the spherical surface has refractive index μ1, the image forms at O’. If this entire medium has refractive index μ3, the image forms at O’’. In the situation shown,