Optics Important Questions

10th Standard EM

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Science

Time : 01:00:00 Hrs
Total Marks : 50
    5 x 1 = 5
  1. Power of a lens is –4D, then its focal length is

    (a)

    4m

    (b)

    –40m

    (c)

    –0.25 m

    (d)

    –2.5 m

  2. In a myopic eye, the image of the object is formed

    (a)

    behind the retina

    (b)

    on the retina

    (c)

    in front of the retina

    (d)

    on the blind spot

  3. The eye defect ‘presbyopia’ can be corrected by

    (a)

    convex lens

    (b)

    concave lens

    (c)

    convex mirror

    (d)

    Bi focal lenses

  4. Which of the following lens would you prefer to use while reading small letters found in a dictionary?

    (a)

    A convex lens of focal length 5 cm

    (b)

    A concave lens of focal length 5 cm

    (c)

    A convex lens of focal length 10 cm

    (d)

    A concave lens of focal length 10 cm

  5. Violet and red light ______ wavelengths.

    (a)

    lowest, highest

    (b)

    highest, lowest

    (c)

    same

    (d)

    standard

  6. 5 x 1 = 5
  7. The path of the light is called as_____________

    ()

    ray

  8. The refractive index of a transparent medium is always greater than__________

    ()

    one

  9. Angle of refraction is _____ for red and _____ for violet.

    ()

    smallest, highest

  10. Refractive index of a medium is dependent on ______ of the light.

    ()

    wavelength

  11. The interacting particle of the medium is called as _______

    ()

    scatterer

  12. 5 x 1 = 5
  13. Ciliary muscles

  14. (1)

    \((\mu -1)\left( \frac { 1 }{ { R }_{ 1 } } -\frac { 1 }{ { R }_{ 2 } } \right) \)

  15. Myopia

  16. (2)

    Power accommodation

  17. violet light

  18. (3)

    Far point comes closer

  19. red light

  20. (4)

    highest wavelength

  21. Lens maker's formula

  22. (5)

    highest frequency

    5 x 2 = 10
  23. Why does the sky appear in blue colour?

  24. Why are traffic signals red in colour?

  25. What are the conclusions obtained from laws of refraction?

  26. How is a rainbow formed?

  27. Name and explain the types of scattering?

  28. 5 x 3 = 15
  29. State the laws of refraction.

  30. Explain Raman Scattering.

  31. Write the sign convention for lenses.

  32. Explain the types of Telescope.

  33. Explain the refraction of light through a glass prism.

  34. 2 x 5 = 10
  35. Differentiate the eye defects: Myopia and Hypermetropia.

  36. Explain the construction and working of a 'Compound Microscope

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