A lens forms a real image of an object at a distance of 20 cm. It is observed that on placing another identical lens in contact with it, the image gets shifted by 10 cm towards the combination. The power of the lens is
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Verified by ExpertsThe correct answer is:
A
5 D
As image formed is real therefore lens must be convex, v = 20 cm. Let f 1 , be focal length for this lens.
After placing it in contact with another lens, the image is shifted 10 cm towards the combination.
i.e,. v = (20 - 10)cm = 10 cm
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