81. Who measured the velocity of light first ?
82. Light houses are places with powerful lights to :
83. It is dangerous to observe Solar eclipse with naked eyes because
84. Formation of shadows can be explained by
85. The locomotion of insects to the source of light is called :
86. Which is an example of Phototropism?
87. Light travels fastest in
88. Light travels slowest in
89. Light from the sun reaches us in nearly
90. An image formed by a plane mirror, that cannot be obtained on a screen is called ________
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