Q5 of 123 Page 410

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.

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In image formation from spherical mirrors, only paraxial rays are considered because they

 4

A point object is placed at a distance of 30 cm from a convex mirror of focal length 30 cm. The image will form at

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The image formed by a concave mirror

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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,