61. The technique used to transmit auto signals in television broadcasts is
62. The head mirror used by ENT doctors is
63. If the radius of curvature of a concave mirror is 6.2 cm, then its focal length will be . . . . . . . . cm.
64. Which one of the following statement is not true for a person suffering from hypermetropia?
65. When light enters the rarer medium through a denser medium, what is the effect on its speed?
66. Person who is colourblind can not distinguish between
67. According to law of reflection
68. When light is incident on a bright surface, . . . . . . . . phenomenon of reflection occurs.
69. Optical fibres are based on the phenomenon of
70. Focal length of concave lens . . . . . . . . it occurs
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