A point object is placed at a distance of 60 cm from a convex lens of focal length 30 cm. If a plane mirror were put perpendicular to the principal axis of the lens and at a distance of 40 cm from it, the final image would be formed at a distance of
Text Solution
Verified by ExpertsThe correct answer is:
D
This real image formed by lens acts as virtual object for mirror.
Real image from plane mirror is formed 20 cm in front of mirror, hence at 20 cm distance from lens.
Now, for second refraction from lens,
So, final virtual image is 60 cm from lens, or 20 cm behind mirror.
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