Draw a neat labelled ray diagram for refracting efracting telescope. Obtain the formula for its magnifying power.
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magnifying power is defined as ratio of angle subtended β by the final image on the eye to the angle subtended α by the object on eye.
M=tanβ/tanα=β/α
or
M= -fo/fe for comfortable view
= -f₀/fe [(1+fe/D)] for strained eye
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