81. In optics, the refractive index of a substance is described by the formula $$n = \frac{c}{v}$$ , where c is
82. In which direction the rainbow is seen at 12 noon?
83. Which of the following statements is true when we see rainbow?
84. A person holding a pen in his left hand sees his reflection in the mirror holding the pen in his right hand. This is due to which of the following phenomena?
85. If objects appear enlarged and inverted in a rear view mirror, then which type of mirror is used?
86. At what medium does light travel maximum speed?
87. Find the distance of an object from a concave mirror whose focal length is 10 cm so that the distance of image from mirror is four times the distance of the object will be-
88. A soap bubble shows colours when illuminated with white light. This is due to . . . . . . . .
89. Speed of light . . . . . . . . is.
90. The mirror always produces an image of the object that is virtual, large and of equal size.
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