Question

41. The equivalent focal length of a combination of two
thin lenses (having focal length f& f2) can be given
by 1/fnet= 1/f; + 1/f2. If errors in measurement of
f& f2 are + 0.5 cm and + 0.3 cm and given that f1 =
f2. Then errors in equivalent focal length is -
(1) ± 0.1
12) 0.8
(3) + 0.2
(4) None​

Answer 1

Answer:

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