A astronomical telescope has objective and eyepiece of focal lengths 40 cm and 4 cm respectively. To view an…

A astronomical telescope has objective and eyepiece of focal lengths 40 cm and 4 cm respectively. To view an object 200 cm away from the objective, the lenses must be separated by a distance:
  1. 37.3  cm
  2. 46.0  cm
  3. 50.0  cm
  4. 54.0  cm

Solution

1V-1-200=140
1V=55140-1200
=5200-1200

1V=4200=150
V=50
∴d=50+4=54 cm

Asked in: NEET 2016 (Phase 1)

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