Ray Optics and Optical Instruments

Bihar Board Class 12 · Physics · 73 past questions

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1. Q8 2025 Set D

   Image formed by convex mirror is always

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2. Q10 2025 Set D

   If two converging lenses of equal focal length $f$ are kept in contact, then the focal length of the…

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3. Q11 2025 Set D

   Power of a convex lens is 2 dioptre. Its focal length will be

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4. Q13 2025 Set D2018

   A convex lens is dipped in a liquid, whose refractive index is equal to the refractive index of the material…

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5. Q15 2024 Set A

   A large virtual image of object is formed by

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6. Q16 2024 Set A

   Powers of two lenses kept in contact, are $P_1$ and $P_2$. The power of equivalent lens will be

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7. Q23 2023 Set F

   The radius of curvature of each surface of a biconvex lens is 20 cm and the refractive index of the material…

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8. Q25 2023 Set F

   A convex lens of focal length 40 cm and a concave lens of focal length 20 cm are in contact. The power of…

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9. Q26 2023 Set F

   A spherical mirror is immersed in water. Its focal length will

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10. Q36 2022 Set I

    The focal length of a lens of capacity 4 dioptre is

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11. Q38 2022 Set I

    If the focal length of a glass lens $\left(\mu=\frac{3}{2}\right)$ in air is $f_a$ and in water…

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12. Q40 2022 Set I

    Power of two lenses in contact is

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13. Q51 2021 Set A

    Power of parallel sided glass-slab is

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14. Q56 2019

    Equivalent focal length of two lenses in contact having power -15D and +5D will be

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15. Q58 2019

    A convex lens (n=1.5) is immersed in water (n=1.33), then it will behave as a

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16. Q60 2019

    Two thin convex lens of power +5 and +4 diopter and placed co-axially at a distance 10 cm. Find the focal…

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17. Q64 2018

    A magnifying glass is to be used at the fixed object distance of 1 inch. If it is to produce an erect image 5…

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18. Q72 2017

    The focal length of a lens $\mu=1.5$ in air is 20 cm. Its focal length is medium of refractive index 1.5 is-

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19. Q73 2017

    A point object is placed above principle axis at a distance three times focal length of a convex lens. Draw… (with a figure)

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