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Ray Optics and Optical Test - 17

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Ray Optics and Optical Test - 17
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Weekly Quiz Competition
  • Question 1
    1 / -0
    The image which can be obtained on a screen is called
    Solution
    The image which can be obtained on a screen is called a real image.
  • Question 2
    1 / -0
    The image which can not be taken on the screen is called
    Solution
    The image which can not be taken on the screen is called a virtual image.
  • Question 3
    1 / -0
    The magnifying power of a simple microscope can be increased if we use an eyepiece of
    Solution
    The only difference between simple microscope and compound microscope is an eyepiece of smaller focal length than objective which increases magnifying power.
  • Question 4
    1 / -0
    Lateral displacement of the emergent ray of light increases with
    Solution
    Lateral displacement produced by a glass slab of thickness t, incident on it at angle of incidence i is
    Lateral displacement $$\delta=\dfrac{t}{\cos r} \sin(i-r)$$
  • Question 5
    1 / -0
    As our eyes can not retrace the bent path of light, a stick, dipped in water, appears
    Solution
    A straight stick, dipped in water, appears to be bent upward as our eyes can not retrace the bent path of light.
  • Question 6
    1 / -0
    Whenever light travels from denser medium to a rarer medium:
    Solution
    Whenever light travels from a denser medium to a rarer medium, it bends away from the normal due to refraction.

  • Question 7
    1 / -0
    Assertion: A concave mirror and convex lens both have the same focal length in air. When they are submerged in water, they will have same focal length.
    Reason: The refractive index of water is smaller than the refractive index of air.
    Solution
    Since the refractive index of air is 1 and the refractive index of water is $$\dfrac{4}{3}$$. Hence the effective refractive of the lens will decrease when dipped in water.
  • Question 8
    1 / -0
    A real image is formed by
    Solution
    When the refracting or reflecting rays actually intersect, rather than pretending to be meeting at a point ,a real image is formed.A real image hence can be obtained on a screen.
  • Question 9
    1 / -0
    The perpendicular distance between the original path of the incident ray and the convergent ray of light coming out of a glass slab is called :
    Solution
    The perpendicular distance between the original path of the incident ray and the emergent ray of light coming out of a glass slab is called lateral displacement. It is proportional to the thickness glass slab.
  • Question 10
    1 / -0
    When the reflecting or refracting rays do not actually intersect but appear to intersect when produced backwards, 
    Solution
    A virtual image is formed when the refracting or reflecting rays do not actually intersect but appear to intersect when they are produced backwards.
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