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Two thin lenses of focal lengths f₁ and f₂ are in contact. The focal length of this combination is

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f1f2f1−f2

f1f2f1+f2

2f1f2f1−f2

2f1f2f1+f2

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detailed solution

Correct option is B

1F=1f1+1f2 F=f1f2f1+f2

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Two thin lenses of focal lengths f1 and f2 are in contact. The focal length of this combination is

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Two thin lenses of focal lengths f₁ and f₂ are in contact. The focal length of this combination is