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The focal lengths of the objective and eyepiece of a telescope are 60cm and 5 cm respectively. Find its magnifying power i) for normal adjustment and ii) when the image is formed at near point.

The focal lengths of the objective and eyepiece of a telescope are 60cm and 5 cm
respectively. Find its magnifying power i) for normal adjustment and ii) when the
image is formed at near point.

Grade:12

2 Answers

G.Rajashekar
41 Points
8 years ago

1)   by using magnifying power of normal adjastment =f0/-fe

                                                                              =-60/5   = -12

 

2)for near point m=fo/fe(1+fe/D) = -14.4

Gangadher
29 Points
8 years ago

By using the formula  -25S''/f.f

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