A small telescope has an objective of focal length 140 cm and an eye piece of focal length 5.0 cm. The magnifying power of telescope for viewing a distant object is: (a) 34 (b) 28 (c) 17 (d) 32

Answer: (b). Distant object (normal adjustment): M = (fo)/(fe). M = 140/5 = 28 So the answer is (b) 28.

A small telescope has an objective of focal length 140 cm and an eye… | NEET 2024

Q13NEET 2024Easy

Optical Instruments & the Eye

A small telescope has an objective of focal length $140\text{ cm}$ and an eye piece of focal length $5.0\text{ cm}$ . The magnifying power of telescope for viewing a distant object is:

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Answer: (b)

Distant object (normal adjustment): $M = \dfrac{f_o}{f_e}$ .
$M = \dfrac{140}{5} = 28$
So the answer is (b) 28.

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