61. Which phenomenon deals with the scattering of light by molecules of a medium, when they are excited to vibrational energy levels?
62. Which type of image of an object is formed by eye lens of the retina?
63. Red light signal is used as a danger signal because
64. The mirror, which is used in searchlights, is
65. The wavelength extension of visible light is
66. Which of the following is an example of scattering of light?
67. The minimum distance of clear vision for a normal healthy eye of human being is supposed to be
68. Which one of the following reflects back more sunlight as compared to other three?
69. The process by which a prism forms different colours, is known as
70. What is the concept of spherical mirror?
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