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Question

A point object is placed at a distance of 25 cm on the axis of a convex lens of focal length 20 cm .On the other side of the lens, a convex mirror is placed at a distance of 50 cm from the lens such that the image formed by the combination coincides with the object itself . The focal length of the convex mirror is
  1. 10 cm
  2. 15 cm
  3. 20 cm
  4. 25 cm

A
25 cm
B
20 cm
C
10 cm
D
15 cm
Solution
Verified by Toppr

1v1u=120

1v1(25)=120

v=100cm (@ centre of curvature)

R=50

f=502=25cm

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