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Light Test - 10...

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  • Question 1
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    A medium through which light passes fully is called

  • Question 2
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    Which of the following electromagnetic waves has the longest wavelength?

  • Question 3
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    The formation of umbra and penumbra regions of the shadow of an opaque sphere by a small light source is due to

  • Question 4
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    An illuminating object is placed between two plane mirrors mutually perpendicular to each other. The number of images formed is

  • Question 5
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    When a plane mirror is placed horizontally on ground level at a distance of 60 m from the foot of a tower, the top of the tower and its image in the mirror subtends an angle of 90o at the eye. The height of the tower is

  • Question 6
    1 / -0

    When an object is placed beyond the centre of curvature for the concave mirror, the characteristics of the image will be

  • Question 7
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    A dentist uses a small mirror that gives a magnification of 4 when it is held 0.60 cm from a tooth. The radius of curvature of the mirror is

  • Question 8
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    A coin dropped in water of refractive index 4/3 up to a real depth of 28 cm will apparently seem to be at a depth of

  • Question 9
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    The refractive index of water is (4/3) and that of glass is (3/2). If the speed of light in glass is 2 108 m/s, the speed of light in water will be

  • Question 10
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    Where should an object be placed so that a real and inverted image of the same size is obtained using a convex lens?

  • Question 11
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    The minimum distance between an object and its real image formed by a convex lens is

  • Question 12
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    In order to increase the magnifying power of a telescope,

  • Question 13
    1 / -0

    In a compound microscope, the intermediate image is

  • Question 14
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    In dispersion by a prism, we can see the colours in the decreasing order of deviation as :

  • Question 15
    1 / -0

    'Dispersion' is the term used to describe

  • Question 16
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    To astronauts in a space ship, the sky appears dark because

  • Question 17
    1 / -0

    Mirages are observed in deserts due to the phenomenon of

  • Question 18
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    In cold countries, the phenomenon of looming (i.e. ship appears in the sky) takes place, because refractive index of air

  • Question 19
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    The power of the eye lens to adjust its focal length according to the distance so that image is formed on the retina, is called

  • Question 20
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    A person can see clearly up to 3 metres. If he wants to see up to 12 metres, he should use a

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