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Optics Important Questions

10th Standard EM

    Reg.No. :
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Science

Time : 01:00:00 Hrs
Total Marks : 50
    9 x 1 = 9
  1. 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

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

    (a)

    convex lens

    (b)

    concave lens

    (c)

    convex mirror

    (d)

    Bi focal lenses

  3. 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

  4. Violet and red light ______ wavelengths.

    (a)

    lowest, highest

    (b)

    highest, lowest

    (c)

    same

    (d)

    standard

  5. We can see objects because of

    (a)

    reflection

    (b)

    refraction

    (c)

    transmission

    (d)

    diffraction

  6. The resolving power depends on

    (a)

    Dimetal of the lens

    (b)

    Wavelength

    (c)

    Refractive index

    (d)

    a & b

  7. A lens which collects image at back of telescope

    (a)

    Objective lens

    (b)

    Diverging

    (c)

    Converging

    (d)

    Polars

  8. In compound microscope, as compare to eye piece, objective lens has _____ focal length.

    (a)

    -ve focal length

    (b)

    Zero

    (c)

    Small

    (d)

    Large

  9. A magnifying glass is also called

    (a)

    Telescope

    (b)

    Compound microscope

    (c)

    Simple microscope

    (d)

    Astronomical telescope

  10. 6 x 2 = 12
  11. State Snell’s law.

  12. Differentiate convex lens and concave lens

  13. What are the causes of ‘Myopia’?

  14. When does Mie scattering take place? Write the causes.

  15. What are the advantages of telescopes?

  16. A concave lens of refractive in μ1 is kept in a medium of refractive index (μ2). A parallel beam of light is incident on the lens. Draw the path of the rays of light emerging from a lens.

  17. 2 x 4 = 8
  18. Explain the working of the eye.

  19. Explain the construction of Simple Microscope and derive its magnification power.

  20. 2 x 7 = 14
  21. An object of height 3cm is placed at 10cm from a concave lens of focal length 15cm. Find the size of the image

  22. While doing an experiment for the determination of focal length of a convex lens, Raja Suddenly dropped the lens. It got broken into two halves along the axis. If he continues his experiment with the same lens, (a) can he get the image? (b) Is there any change in the focal length?

  23. 1 x 7 = 7
  24. The far position of a myopic person is 90 cm in front of the eye. What is the nature and power of the lens required to correct the problem?

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