61. When a person enters into a dark room from the strong light area, he is not able to see clearly for some time. Later he gradually begins to see things. This is because
62. The point at which all the rays meet is called . . . . . . . .
63. For a ray of light to suffer total internal reflection, it has to pass from
64. A person is unable to read a newspaper without his glasses. He is most probably suffering from
65. What is the principal focus of a spherical mirror?
66. A spherical mirror and a thin spherical lens each have a focal length of -20 cm. Which of the following is likely to be true in such a scenario?
67. When the sun is near the horizon during the morning or evening, it appears reddish. The phenomenon that is responsible for this observation is
68. In case of reflection, it is well known that, when a mirror turned through an angle the reflected ray turns through
69. When light enters the denser medium through rarer medium, it is slow and . . . . . . . .
70. The speed of light in vacuum is estimated to be . . . . . . . . m/s.
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