Geometrical Optics Test Quiz!

10 Questions | Total Attempts: 16

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Geometrical Optics Test Quiz!

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Questions and Answers
  • 1. 
    If x and y be the distance of the object and the image formed by a concave mirror from its focus and f be the focal length, then
    • A. 

      Xy=f

    • B. 

      Xy=f2

    • C. 

      X/y  =f

    • D. 

      X/y  =f2

  • 2. 
    A double convex lens of focal length f is cut into 4 equivalent parts. One cut is perpendicular to the axis and the other is parallel to the axis of the lens. The focal length of each part is
    • A. 

      F/2

    • B. 

      F

    • C. 

      2f

    • D. 

      4f

  • 3. 
    A concave lens of focal length f produces an image (1/n) times the size of the object. The distance of the objectfrom the lens is: 
    • A. 

      (n - 1)f

    • B. 

      (n + 1)f

    • C. 

      (n-1)f /n

    • D. 

      (n+1)f /n

  • 4. 
    A thin convex lens forms the distinct image of an object on a screen placed at a distance of 30 cm from the lens. When the lens is displaced 5 cm towards the screen then in order to obtain distinct image the screen is displaced 5 cm towards the lens. The focal length of the lens is:
    • A. 

      5 cm

    • B. 

      10 cm

    • C. 

      15 cm

    • D. 

      20 cm

  • 5. 
    Two identical glass (ng= 3/2) equiconvex lenses of focal length f each are kept in contact. The space between the two lenses is filled with water(nw=4/3). The focal length of the combination is:
    • A. 

      3f/4

    • B. 

      F/3

    • C. 

      F

    • D. 

      4f/3

  • 6. 
    The refracting angle of a prism is A and the refractive index of its material is a cot(A/2). The angle of minimum deviation is: 
    • A. 

      180- 3A

    • B. 

      180+ 2A

    • C. 

      90- A

    • D. 

      180- 2A

  • 7. 
    A thin prism of glass placed in air produces a deviation of 40 in a light ray. if the prism is placed in water, what would be the new deviation in degree? ang =3/2 and anw= 4/3.
    • A. 

      7

    • B. 

      1

    • C. 

      5

    • D. 

      3

    • E. 

      Option 5

  • 8. 
    When the space between the object and the objective of a microscope is filled with water, then the resolving power:
    • A. 

      May increase or decrease

    • B. 

      Decreases

    • C. 

      Remains unchanged

    • D. 

      Increases

  • 9. 
    The distance between the objective of a compound microscope and the real image formed by it is 18 cm. If f0 = 0.4 cm, fe= 2.0 cm, then the magnifying power of the microscope for the final image formed at the least distance of distinct vision will be
    • A. 

      -- 178

    • B. 

      +320

    • C. 

      -- 594

    • D. 

      +725

  • 10. 
    An astronomical telescope set for normal adjustment has a magnifying power 10. If the focal length of the objective is 1.20 m, the focal length of the eye piece will be:
    • A. 

      19 cm

    • B. 

      25 cm

    • C. 

      5 cm

    • D. 

      12 cm