MHT CET Physics question
A concave mirror of focal length '' is placed at a distance 'd' from a convex lens of focal length ''. A parallel beam of light coming from infinity parallel to principal axis falls on the convex lens and then after refraction falls on the concave mirror. If it is to retrace the path, the distance 'd' should be [MHT-CET 2021]
Answer: (A)
Solution
The lens focuses the beam at distance from it; the rays retrace their path only if they fall normally on the mirror, i.e. this focus is at the centre of curvature of the mirror, in
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