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Question

A biconvex lens of focal length 15 cm is in front of a plane mirror.The distance between lens and the mirror is 10 cm. A small object is kept at a distance of 30 cm from the lens. The final image is:
  1. virtual and at a distance of 20 cm from the mirror
  2. real and at a distance of 20 cm from the mirror
  3. virtual and at a distance of 16 cm from the mirror
  4. real and at a distance of 16 cm from the mirror

A
real and at a distance of 16 cm from the mirror
B
virtual and at a distance of 16 cm from the mirror
C
real and at a distance of 20 cm from the mirror
D
virtual and at a distance of 20 cm from the mirror
Solution
Verified by Toppr

The correct option is B real and at a distance of 16 cm from the mirror
1f=1v1u115=1v130v=+30115=1v110115+110=1vv=15025=+6 cm

The final image ˆI3 is 6 cm (real) from
the lens.
10+6=16 cm
from the mirror ( real)
So option B is correct.

2005767_1011039_ans_3436b17b947746d8b4077366705e234a.PNG

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