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Light Test - 9

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Light Test - 9
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  • Question 1
    1 / -0
    A body which has no light of its own, but is visible because it reflects light, is called
  • Question 2
    1 / -0
    Objects that allow light to pass through them partially are called
  • Question 3
    1 / -0
    Region where the light is totally or partially cut off by an opaque body is called
  • Question 4
    1 / -0
    Rectilinear propagation of light means
    Solution

    In a same transparent medium, light travels in a straight line and this is known as rectilinear propagation of light. When an electromagnetic wave transfer its energy from one point to another, this is also called rectilinear propagation of light.

  • Question 5
    1 / -0
    What is the principal cause of lunar eclipse?
  • Question 6
    1 / -0
    The point on a lens, where a light ray on passing through it suffers no deviation, is called
  • Question 7
    1 / -0
    The phenomenon according to which the wave oscillations are restricted to a particular plane is called
  • Question 8
    1 / -0
    A virtual image larger than the object can be produced by
    Solution
    Convex mirror always produces the diminished and virtual images.
    Plane mirror produces the virtual image of the same size.
    Concave mirror produces the virtual and enlarged image when the object is placed between the focus and the pole.


  • Question 9
    1 / -0
    Given a point source of light, which of the following can produce a parallel beam of light?
  • Question 10
    1 / -0
    Line passing through the pole and the centre of curvature of spherical mirror is called
  • Question 11
    1 / -0
    Rajan moves towards a plane mirror with a speed of 8 m/s. Then, he sees his image to be moving towards him with a speed of
  • Question 12
    1 / -0
    The rear view mirror used in a car is
    Solution
    Convex mirrors are commonly used as rear-view mirrors in vehicles because they give erect, virtual, full size, and diminished images of distant objects with a wider field of view.
  • Question 13
    1 / -0
    The image formed by convex lens is virtual when the object is placed
  • Question 14
    1 / -0
    In the case of a concave mirror the image coincides with the object, when the object is placed at
  • Question 15
    1 / -0
    To see very small objects (which are not visible to naked eyes) we can use
  • Question 16
    1 / -0
    In a compound microscope, focal length of the eye piece is
  • Question 17
    1 / -0
    Which of the following has the shortest wavelength in visible spectrum?
  • Question 18
    1 / -0
    When a beam of white light is dispersed with the help of a prism, which of the following colours will be most deviated?
    Solution
    The angle of deviation (δ) of the light in the prism depends upon the refractive index of the medium (μ),

    The refractive index of the medium depends upon the wavelength, i.e. lesser the wavelength of the light, greater is the refractive index.
    Violet light has the minimum wavelength in the visible spectrum, so the refractive index corresponding to the violet light is maximum and corresponding angle of deviation is maximum.
    So, violet light will deviate the most and red light will deviate the least.
  • Question 19
    1 / -0
    Which of following will be true, when light travels in water?
  • Question 20
    1 / -0
    A 5 ft tall man wishes to see his full image in a plane mirror. The minimum height of plane mirror needed for this purpose is
    Solution
    5 ft is equivalent to 1.524m
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