Physics, asked by tiny000, 6 months ago

49. Two thin lenses have focal lengths 20 cm and -40 cm. The focal length of
combination in contact is

Answers

Answered by amoghnasa

1

Explanation:

fnet = (f1*f2)/(f1+f2)

fnet = 20(-40)/20-40 = -800/-20

fnet = +40cm

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