How do you find the focal length of the system when?
(a) Two lenses are touching each other.
(0) They are separated by a distance d' with common principal axis.
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Answer:
A) 1/f = 1/f1 + 1/f2
with sign
convex lens f +ve
Concave lens f -ve
B). 1/f = 1/f1 + 1/f2 - 2d/f1f2
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