the convex lens of focal length 20cm each are seperated by a distance of 10cm for focal length of combination is :-
a)20 cm
b)40cm
c)30 cm
d) 13.3 cm
pls explain me the answer!!
Asked by my3shyll | 28th Jan, 2017, 10:16: PM
Expert Answer:
Answered by Romal Bhansali | 29th Jan, 2017, 01:51: PM
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