71. An optically plane surface reflects a beam of light as
72. Distant objects can be seen with the help of
73. While watching 3D movies in the theater, we have to wear special glasses because:
74. Brilliance of diamond is due to
75. To remove the defect of long sightedness one uses
76. Which of the following statements is true?
77. Raman effect' deals with the light rays passing through
78. An object is placed on the principal axis of a convex lens of focal length 10 cm. If the distance of the object from the lens is 30 cm. What is the distance of the image formed?
79. The optical phenomenon that is primarily responsible for the observation of rainbow on a rainy day is
80. When an object is kept between two parallel plane mirrors then what is the number of images formed?
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