81. . . . . . . . . is also called a convergence mirror-
82. A point on the principle axis of lens through which light rays pass undeviated, is called
83. Which one of the following statements is not correct?
84. The power of a lens is measured in
85. The focal length of a concave mirror with radius of curvature of 20 cm will be-
86. The lens which is thin in the middle and thick at its periphery is called as?
87. The principle due to which circular patches of light is seen under a tree during day time is similar to that of image formation by a
88. . . . . . . . . is used in periscope.
89. Which of the following statement(s) is/ are correct for critical angle?
1. Refractive angle is 90°.
2. Light ray goes from rarer to denser medium.
3. Light ray goes from denser to rarer medium.
1. Refractive angle is 90°.
2. Light ray goes from rarer to denser medium.
3. Light ray goes from denser to rarer medium.
90. The image for a plane mirror is:
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