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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:

  1. A.28✓
  2. B.17
  3. C.32
  4. D.34

Solution

For a distant object, m=fofe=1405=28m = \frac{f_o}{f_e} = \frac{140}{5} = 28.

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