A thin convex lens of focal length T is put on a plane mirror as shown in the figure. |
When an object is kept at a distance 'a' from the lens - mirror combination, its image is formed at a distance\[\frac{a}{3}\]in front of the combination. The value of 'a' is: [JEE MAIN 11-04-2015] |
A) f
B) 2f
C) 3f
D) \[\frac{3}{2}f\]
Correct Answer: B
Solution :
[b] |
This combinations will behave like a mirror of power. |
so the behaviour will be like a mirror of focal length |
Using mirror equation |
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