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Optics MCQs for NEET — Physics Questions with Answers

Practice free Optics (Physics) NEET multiple-choice questions online with instant answers and detailed explanations. No login required.

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NEET 2024
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A light ray enters through a right angled prism at point P with the angle of incidence $30^\circ$ as shown in figure. It travels through the prism parallel to its base $BC$ and emerges along the face $AC$. The refractive index of the prism is:

A B C P 30°
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Explanation

With right angle at apex A and ray parallel to BC inside, then grazing AC at critical angle: $\tan C = 1/2$, so $n = \sec C = \dfrac{\sqrt 5}{2}$.

NEET 2024
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A small telescope has an objective of focal length 140 cm and an eye piece of focal length 5.0 cm. The magnifying power of telescope for viewing a distant object is:

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Explanation

$M = f_o/f_e = 140/5 = 28$.

NEET 2025
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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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Explanation

$m = \dfrac{L}{f_o}\cdot\dfrac{D}{f_e} = \dfrac{40}{2}\times\dfrac{25}{4} = 20\times 6.25 = 125$.

NEET 2025
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In a certain camera, a combination of four similar thin convex lenses are arranged axially in contact. Then the power of the combination and the total magnification in comparison to the power $(p)$ and magnification $(m)$ for each lens will be, respectively:

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Explanation

Powers in contact add: $P = 4p$. Magnifications multiply: $M = m^4$.

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