Ray Optics and Optical Instruments is an important topic in the Physics section in BITSAT exam. Practising this topic will increase your score overall and make your conceptual grip on BITSAT exam stronger.
This article gives you a full set of BITSAT PYQs for Ray Optics and Optical Instruments with explanations for effective preparation. Practice of BITSAT Physics PYQs including Ray Optics and Optical Instruments questions regularly will improve accuracy, speed, and confidence in the BITSAT 2026 exam.
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BITSAT PYQs for Ray Optics and Optical Instruments with Solutions
1.
Find the focal length of a lens in a compound lens system.- \( \frac{1}{f_{total}} = \frac{1}{f_1} + \frac{1}{f_2} \)
- \( \frac{1}{f_{total}} = \frac{1}{f_1} - \frac{1}{f_2} \)
- \( f_{total} = f_1 + f_2 \)
- \( f_{total} = f_1 - f_2 \)
2.
A concave mirror produces an image that is real, inverted, and diminished. What is the position of the object in relation to the mirror?- At the focal point
- Between the focus and the mirror
- Beyond twice the focal length
- Between the focus and twice the focal length
3.
A radio wave travels in a medium with refractive index 1.5. What is the speed of light in this medium if the speed of light in vacuum is \(3 \times 10^8 \, \text{m/s}\)?- \(2 \times 10^8 \, \text{m/s}\)
- \(1.5 \times 10^8 \, \text{m/s}\)
- \(2.5 \times 10^8 \, \text{m/s}\)
- \(1.6 \times 10^8 \, \text{m/s}\)
4.
A convex lens has focal length 20 cm. An object is placed at a distance of 40 cm from the lens. What is the position of the image formed?- 40 cm on the opposite side
- 20 cm on the same side
- 20 cm on the opposite side
- 40 cm on the same side
5.
On a hypotenuse of a right prism $\left(30^{\circ}-60^{\circ}-90^{\circ}\right)$ of refractive index $1.50$, a drop of liquid is placed as shown in figure. Light is allowed to fall normally on the short face of the prism. In order that the ray of light may get totally reflected, the maximum value of refractive index is :- 1.3
- 1.47
- 1.2
- 1.25
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