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Wave Optics
Question
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Here three lenses have been given. Which two lenses will you use as an eyepiece and as an objective to construct an astronomical telescope? 

Lenses

Power (P)

Aperture (A)

L1

3D

8 cm

L2

6D

1 cm

L3

10D

1 cm

 

Answer

For an astronomical telescope, since the aperture of lens L1 is largest, it is used as objective for a telescope. The focal length of lens L3 is smaller and hence cn be used as eyepiece.

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