A microscope has an objective of focal length 2 cm, eyepiece of focal length 4 cm and the tube length of 40 cm. If the distance of distinct vision of eye is 25 cm, the magnification in the microscope is 

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NEET 2025 Official Paper (Held On: 04 May, 2025)
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  1. 100
  2. 125
  3. 150
  4. 250

Answer (Detailed Solution Below)

Option 2 : 125
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Calculation:

Objective focal length (fo) = 2 cm

Eyepiece focal length (fe) = 4 cm

Tube length (L) = 40 cm

Distance of distinct vision of eye (D) = 25 cm

Formula for magnification (m) of the microscope:

m = (L / fo) × (D / fe)

⇒ m = (40 / 2) × (25 / 4)

⇒ m = 125

Final Answer: The magnification in the microscope is 125.

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