The compound mirroscope consists of two convex lenses of 5 cm and 20 cm focal length, then which of them will be object lens and eye piece ?
(A) Object lens with 20 cm focal length and eye piece with 5 cm focal length.
(B) Object lens with 5 cm focal leugth and eye piece with 20 cm focal length.
(C) Both should have 20 cm focal length.
(D) Both should have 5 cm focal length.
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answer :- option (B) object lens with 5 cm focal length and eye piece with 20cm focal length.
we know,
e.g.,
where is the focal length of objective lens .
is the focal length of eye piece lens.
we know,
e.g.,
where is the focal length of objective lens .
is the focal length of eye piece lens.
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