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# Two plano-convex lenses of same material and of focal lengths f and 2f are coaxially separated by a suitable distace to minimize chromatic aberration. The equivalent focal length of the combination isf3f/23f/44f/3

A
3f/4
B
3f/2
C
f
D
4f/3
Solution
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#### d=f2+f12=2f+f2=3f2feq=f×2f−3f2+2f+f=2f23f2=4f3

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