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Question

In the adjoining diagram, distance between two lenses will be (F1 and F2 are focal length of two lenses)
1234908_761ad3941e59403fb0d89b5a5117c6d4.png

A
F1
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B
F2
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C
F1+F2
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D
F1F2
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Solution

The correct option is C F1+F2
As the rays are coming parallel to the principle axis inf L1 , so it will converge at the focus of Lens Li, i.e. F. And, these converging ray at F1 become pallalel to the principle axis of Lens L2 .

And we xnow that if a ray
pass through the focus of the
lens, then it become parallel
to the principle axis of the lens.

so, converging point of ray must
be F2 distance (focaldistance) from
the L2. Distance between lenses (L1&L2)
=F1+F2

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