Optics 7 Question 32
33. Consider a concave mirror and a convex lens (refractive index ) of focal length each, separated by a distance of in air (refractive index =1) as shown in the figure. An object is placed at a distance of from the mirror. Its erect image formed by this combination has magnification .
(2015 Adv.)
When the set-up is kept in a medium of refractive index
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Solution:
- Case I
Reflection from mirror
For lens
(in air)
Case II For mirror, there is no change.
For lens,
with
We get