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COMEDK202510 May 2025Evening ShiftPhysicsRay OpticsActual

The focal lengths of the objective and eyepiece of a compound microscope are 1 cm and 10 cm respectively. Length of the tube is 25 cm . If the final image is formed at infinity, the magnifying power of the microscope is:

Options

  1. A7.0
  2. B3.5
  3. C35
  4. D70

Correct answer

C. 35

Step-by-step solution

Given the focal length of the objective f_o = 1 cm and the focal length of the eyepiece f_e = 10 cm. The length of the tube L is the distance between the second focal point of the objective and the first focal point of the eyepiece. For a compound microscope, when the final image is formed at infinity, the distance between the objective and the eyepiece is v_o + f_e . The tube length L is given as 25 cm. In the standard configuration where the final image is at infinity, the distance between the lenses is v_o + f_e

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