Asked by Renuka Ganesh | 22nd May, 2014, 02:47: PM

Expert Answer:

First let us consider the refraction of ray OA by the biconvex lens of focal length 15 cm.
Using the formula
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Which gives that the image I' is formed 30 cm from the lens ,i. e. 20 cm from the mirror(to the right of mirror) .
Or we can say that the object for the plane mirror is 20 cm to the right of the plane mirror.
After reflection from mirror a virtual image O' of object I' is formed as shown in the figure above such that O'P = PI',so O' is 10 cm to left of lens (20-10).
Now O' serves as the virtual object for the refraction of ray BC by the lens.
For this refraction u = +10 cm , f =15 cm
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i.e image is formed at 6 cm from lens .So the final image I will be formed at 10 cm +6 cm =16 cm from the mirror .
So the image formed is real at a distance of 16 cm from the mirror.
Correct option (B)

Answered by Jyothi Nair | 23rd May, 2014, 11:35: AM

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