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NEET 2016
Exam
NEET
Year
2016
Subject
Physics
Chapter
Ray Optics

NEET 2016 · Physics · Ray Optics

A astronomical telescope has objective and eyepiece of focal...

A astronomical telescope has objective and eyepiece of focal lengths 40cm40 cm and 4cm4 cm respectively. To view an object 200cm200 cm away from the objective, the lenses must be separated by a distance:A astronomical telescope has objective and eyepiece of focal lengths 40 cm and 4 cm respectively. To view an object 200

Options

  1. A37.3cm37.3\text{cm}
  2. B46.0cm46.0\text{cm}
  3. C50.0cm50.0\text{cm}
  4. D54.0cm54.0\text{cm}

Correct answer

D. 54.0cm54.0\text{cm}

Step-by-step solution

1V−1−200=140\dfrac{1}{V} - \dfrac{1}{- 200} = \dfrac{1}{40}

1V=55140−1200\dfrac{1}{V} = \dfrac{5}{5}\dfrac{1}{40} - \dfrac{1}{200}

=5200−1200= \dfrac{5}{200} - \dfrac{1}{200}

A astronomical telescope has objective and eyepiece of focal lengths 40 cm and 4 cm respectively. To view an object 200

1V=4200=150\dfrac{1}{V} = \dfrac{4}{200} = \dfrac{1}{50}

V=50V = 50

∴d=50+4=54cm∴ d = 50 + 4 = 54cm

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