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Q.

If two convex lenses of focal lengths f1, f2 are separated by a distance ‘d’ such that the combination will act as parallel sided glass slab, then d =

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a

f1 + 2f2

b

f1 - f2

c

f1 + f2

d

2f1 + f2

answer is D.

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Detailed Solution

1F=1f1+1f2−df1f2 ∴ SinceF =∞d=f1+f2

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If two convex lenses of focal lengths f1, f2 are separated by a distance ‘d’ such that the combination will act as parallel sided glass slab, then d =