81. The radius of curvature of the plane mirror is
82. An object at 1.2 cm height is placed 30 cm before a concave mirror of focal length of 20 cm to get a real image at a distance of 60 cm from the mirror. What is the height of the image formed?
83. A convex mirror focal length f (in air), is immersed in a fluid $$\left( {\mu = \frac{4}{3}} \right)$$ . The focal length of the mirror in liquid will be-
84. Rainbow is a natural phenomenon, which shows . . . . . . . .
85. The Sky appears blue due to
86. When an object is placed outside the center of curvature of a concave mirror, the image will form:
87. Given below are two statements, one labelled as Assertion (A) and other labelled as Reason (R).
Assertion (A): A diamond sparkles more than a glass imitation cut to the same shape.
Reason (R): The refractive index of diamond is less than that of glass.
In the context of the above two statements, which one of the following is correct?
Assertion (A): A diamond sparkles more than a glass imitation cut to the same shape.
Reason (R): The refractive index of diamond is less than that of glass.
In the context of the above two statements, which one of the following is correct?
88. The time taken to reach the Sunlight up to the surface of Earth is approximately
89. What will be the focal length when human eye lens becomes thin?
90. In the visible spectrum, the colour having the shortest wavelength is
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