Question

An astronomical refracting telescope consist of two lenses of focal focal lengths 75cm and 5cm. Calculate the magnifying power of the telescope when the final image is formed at a distance of 25cm from the eye​

Answer 1

Given info : An astronomical refracting telescope consist of two lenses of focal focal lengths 75cm and 5cm.

To find : we have to magnifying find the power of the telescope when the final image is formed at a distance of 25cm from the eye.

solution : using formula,

magnifying power, m = $-\frac{f_0}{f_e}\left(1+\frac{f_e}{D}\right)$

here focal length of eye piece, $f_e$ = 5 cm

focal length of object piece, $f_0$ = 75 cm

the power of accomodation of human eye, D = 25cm

so, m = -75/5(1 + 5/25)

= -15(1 + 1/5) = -15 × 6/5

= -18

Therefore magnifying power of the telescope is -18.

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Answer 2

Explanation:

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