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If two lenses wlth focal lengths 10 cm ...

If two lenses wlth focal lengths 10 cm and 20 cm respectively are kept in contact with each other, the effective power of the combination is ……………….. .

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To find the effective power of two lenses kept in contact, we can follow these steps: ### Step-by-Step Solution: 1. **Identify the Focal Lengths**: - The focal lengths of the two lenses are given as: - Lens 1 (f₁) = 10 cm - Lens 2 (f₂) = 20 cm ...
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