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Two thin lenses of focal lengths f1 and f2 are in contact and coaxial. The power of the combination is

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a

f1f2

b

f2f1

c

f1+f2f1−f2

d

f1+f2f1f2

answer is D.

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Detailed Solution

If two thin lenses of focal lengths f1 and f2 are placed in contact coaxially, then equivalent focal length of combination is1F=1f1+1f2−0f1f2=1f1+1f2Power for the combination isP=1F=1f1+1f2=f1+f2f1f2

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Two thin lenses of focal lengths f1 and f2 are in contact and coaxial. The power of the combination is