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Physics · PYQ NEET UG 2025
हिन्दीA microscope has an objective of focal length \( 2\text{ cm} \), eyepiece of focal length \( 4\text{ cm} \) and the tube length of \( 40\text{ cm} \). If the distance of distinct vision of eye is \( 25\text{ cm} \), the magnification in the microscope is
Correct answer · Option 3
150
Explanation
Using \( m \approx \frac{L}{f_o} (1 + \frac{D}{f_e}) \), substituting \( L = 40\text{ cm} \), \( f_o = 2\text{ cm} \), \( f_e = 4\text{ cm} \), and \( D = 25\text{ cm} \) gives \( m = 20 \times (1 + 6.25) = 150 \).
