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प्रश्न
Define refracting telescope magnifying power and write the expression for it ?
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उत्तर
Magnifying Power: The magnifying power m is the ratio of the angle α subtended at the eye by the final image to the angle β which the object subtends at the lens or the eye.
`m≈β/α ≈h/f_e . f_o/h =f_o/f_e`
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