Question

Four lenses of focal length +10 cm, +50 cm,
+100 cm and +200 cm are available for
making an astronomical telescope. To
produce the largest magnification, the focal
length of the eyepiece should be:-
(1) +10 cm
(2) +50 cm
(3) +100 cm
(4) +200 cm​

Answer 1

Answer:

10cm

Explanation:

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Answer 2

Answer:

✡(1) +10cm ☑

Explanation:

We know magnification =1/f

So magnification is Inversly proportion to it's focal length.

So which lenses focal length is less their magnification is more and which lenses focal length is more then their magnification is less.

✅Hence,less focal length is +10 cm then this has largest magnification.

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