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NEET 2025 · Optical Instruments & the Eye

Optical Instruments & the Eye question from NEET 2025

Q9NEET 2025Medium

Optical Instruments & the Eye

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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Answer: (d)

Normal adjustment: $M = \dfrac{L}{f_o} \cdot \dfrac{D}{f_e}$ .
$M = \dfrac{40}{2} \times \dfrac{25}{4} = 20 \times 6.25 = 125$ .
So the answer is (d) 125.

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