A convex and a concave lens separated by distance are then put in contact. The focal length of the combination
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Verified by ExpertsThe correct answer is:
D
: Focal length of a combination is
As is negative,
.
When put together, .
.
Therefore the focal length for this combination, become larger. If , this combination gives infinity in contact and not zero. Therefore for the option given different focal lengths are assumed.
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