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If two lense with focal lengths 10 cm an...

If two lense with focal lengths 10 cm and -20 cm respectively are kept in contact with each other, what will be the effective power of the combination of the lenses ?

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To find the effective power of the combination of two lenses with given focal lengths, we can follow these steps: ### Step-by-Step Solution: 1. **Identify the Focal Lengths**: - The focal length of the first lens (F1) is +10 cm. - The focal length of the second lens (F2) is -20 cm. ...
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