Ray Optics and Optical Instruments

Bihar Board Class 12 · Physics · 73 past questions

1. Q1 2026 Set A2018

   To remove hyper metropia lens used is…

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2. Q2 2026 Set A2023 Set F2019

   Differentiate between primary and secondary rainbow.

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3. Q3 2026 Set A

   A ray of light is incident normally on a plane mirror. The angle of reflection will be

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4. Q4 2026 Set A

   The refractive index of water is 1.33. What will be the speed of light in water ?

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5. Q5 2026 Set A

   The field of view is maximum for

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6. Q6 2026 Set A

   When the tube length of microscope is increased, its magnifying power

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7. Q7 2026 Set A

   Inverse square law of intensity of light, i.e., intensity $\propto \frac{1}{r^2}$ is applicable for

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8. Q8 2025 Set D

   Image formed by convex mirror is always

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9. Q9 2025 Set D

   If the critical angle for total internal reflection from any medium to vacuum is $30^\circ$, then the…

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10. 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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11. Q11 2025 Set D

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

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12. Q12 2025 Set D

    Which of the following is used to reduce chromatic aberration in lenses?

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13. 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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14. Q14 2025 Set D

    A person uses spectacles (lens) of +2D power. His defect of vision is

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15. Q15 2024 Set A

    A large virtual image of object is formed by

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16. 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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17. Q17 2024 Set A

    The wavelength of which colour is minimum ?

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18. Q18 2024 Set A

    Which causes the formation of rainbow ?

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19. Q19 2024 Set A

    Image formed in compound microscope is

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20. Q20 2024 Set A

    Image of any object formed at the retina of human eye is

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21. Q21 2024 Set A

    Convex lens is used in

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22. Q22 2024 Set A

    The colour of sky is blue due to

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23. 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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24. Q24 2023 Set F

    The dispersive power of a prism depends on

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25. 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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26. Q26 2023 Set F

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

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27. Q27 2023 Set F

    The coefficient of reflection for total internal reflection will be

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28. Q28 2023 Set F

    The final image formed by a terrestrial telescope is

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29. Q29 2023 Set F

    The critical angle for total internal reflection of a ray from any medium to vacuum is 30°. Then velocity of…

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30. Q30 2022 Set I

    $_1\mu_2$ is equal to

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31. Q31 2022 Set I

    Image formed on retina is

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32. Q32 2022 Set I

    The magnification power of Astronomical Telescope is

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33. Q33 2022 Set I

    Which of the following is the cause of formation of rainbow ?

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34. Q34 2022 Set I

    Which of the following is not electromagnetic wave ?

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35. Q35 2022 Set I

    Critical angle for transparent medium diamond is

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36. Q36 2022 Set I

    The focal length of a lens of capacity 4 dioptre is

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37. Q37 2022 Set I

    Which of the following is correct for dispersive power ?

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38. 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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39. Q39 2022 Set I

    Magnifying power of simple microscope is

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40. Q40 2022 Set I

    Power of two lenses in contact is

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41. Q41 2022 Set I

    If $\mu_g = 3/2$ and $\mu_w = 4/3$ then ${}^w\mu_g$ is

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42. Q42 2022 Set I

    Critical angle for glass is

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43. Q43 2022 Set I

    The refractive index of material of the Prism is

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44. Q44 2021 Set A

    The image formed by simple microscope is

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45. Q45 2021 Set A

    Which of the following eye defects is removed by convex lens ?

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46. Q46 2021 Set A

    Which of the following relations is correct for dispersive power ?

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47. Q47 2021 Set A

    Velocity of light in vacuum is $c$. Its value in glass ($\mu = 3/2$) will be

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48. Q48 2021 Set A

    The length of an astronomical telescope for normal adjustment is

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49. Q49 2021 Set A

    Focal length of eye-lens of a healthy man is about

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50. Q50 2021 Set A

    Which of the following is correct for refractive index of mean colour ( yellow colour ) ?

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51. Q51 2021 Set A

    Power of parallel sided glass-slab is

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52. Q52 2021 Set A

    Angular dispersion is equal to

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53. Q53 2021 Set A

    Which of the following is correct for Astronomical telescope ?

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54. Q54 2019

    Deviation of a thin prism of refractive index n and angle of prism A is

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55. Q55 2019

    Which one of the following has maximum refractive index

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56. Q56 2019

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

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57. Q57 2019

    Cylindrical lenses are used to correct the eye defect called

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58. 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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59. Q59 2019

    The magnifying power of an astronomical telescope for normal adjustment is

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60. 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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61. Q61 2019

    Velocity of light in medium A is v and velocity of light in medium B in 2v. If refractive index of medium A…

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62. Q62 2018

    The image formed by objective lens of a Compound Microscope is…

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63. Q63 2018

    Critical angle for light moving from medium I to medium II is $\theta$. The speed of light in medium I is v.…

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64. 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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65. Q65 2018

    Which of the following phenomenon takes place when a monochromatic light is incident on a prism ?

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66. Q66 2018

    The resolving power of human eye (in minute) is…

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67. Q67 2018

    A fish is at a depth of $\sqrt{7}$ cm and it can see only through a circular section of water surface. What… (with a figure)

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68. Q68 2018

    A small pin is fixed on a table and it is viewed from a distance of 50 cm from above. A glass slab of…

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69. Q69 2017

    A short sighted person uses for clear vision-

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70. Q70 2017

    The critical angle of light passing from glass to air is minimum for-

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71. Q71 2017

    The angle of minimum deviation for thin prism of refractive index $\mu$ is

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72. 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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73. 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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