Ray Optics and Optical Instruments

CBSE Class 12 · Physics · 23 past questions

7 of 23 · show all

1. Q1 2026

   A thin plano-convex lens and a thin equi-concave lens are kept coaxially in contact as shown in the figure.… (with a figure)

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2. Q5 2026

   A concave lens of focal length 10 cm is cut into two identical plano-concave lenses. The focal length of each…

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3. Q8 2026

   In an experiment with convex lens of focal length f, the screen is fixed at a distance D from the object. A…

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4. Q10 2025

   An equiconvex lens is made of glass of refractive index 1·55. If the focal length of the lens is 15·0 cm…

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5. Q13 2024

   Questions number 13 to 16 are Assertion (A) and Reason (R) type questions. Two statements are given — one…

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6. Q18 2024

   A convex lens (n = 1·52) has a focal length of 15·0 cm in air. Find its focal length when it is immersed in…

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7. Q23 2022

   Two transparent media of refractive indices $n_1$ and $n_2$ are separated by a spherical transparent surface.…

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