61. Which mirror is used as a rear view mirror for the wider field of view in vehicles?
62. If an object is placed between the focus and the pole in a concave mirror, what will be the type of image formed?
63. Who measured the velocity of light first?
64. Find out the odd colour from the following options.
65. Three colours are the primary colours. These are
66. Where is the image of an object formed in the eye of a person suffering from longsightedness?
67. Photosynthesis using the invisible part of the Sunlight is done by some
68. Power of a lens is inversely proportional to . . . . . . . .
69. A rainbow is produced due to which one of the following phenomena?
70. The use of a concave mirror is not:
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