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A simple microscope has a combination of...

A simple microscope has a combination of two lens of power `+10 D and + 20 D`. Determine the magnifying power of microscope if the image is formed at a distance of 25 cm in front of the eye.

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To determine the magnifying power of a simple microscope with two lenses of powers +10 D and +20 D, we will follow these steps: ### Step 1: Calculate the Effective Power of the Combination of Lenses The effective power \( P_{equiv} \) of the combination of two lenses is the sum of their individual powers: \[ P_{equiv} = P_1 + P_2 ...
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