Question

Two thin lenses are in contact and the focal length of the combination is 60 cm. If the focal length of one lens is 20 cm, then the power of the other lens will be

Answer 1

Hii

you are welcome in my ans

since p=1/f

so

p1 + p2 = 1/60

given f1=20cm

p2 = 1/60 - 1/20

p2 = -2/60cm

p2 = -1/30cm =-10/3 m=3.333'm

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