PhysicsNEET 2024Optical instruments: microscope and telescope

Ray Optics and Optical Instruments

A small telescope has an objective of focal length 140 cm and an eyepiece of focal length 5.0 cm. The magnifying power of the telescope for viewing a distant object is:

A.28✓
B.17
C.32
D.34

Solution

For a distant object, $m = \frac{f _{o}}{f _{e}} = \frac{140}{5} = 28$ .

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