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Define refractive index of a transparent medium. What is its unit? Which has a higher refractive index glass or water? The radius of curvature of a spherical mirror is 20 cm. What is its focal length

Answer»

Solution :The ratio of the speed of light in the FREE space (c) to the speed of light in given medium (V) is CALLED its refractive index.
`n = C/V
It has no unit, glass has more refractive index than water.
Radius of CURVATURE, R = 20CM
Radius of curvature of a spherical mirror = 2 x Focal length (f)
`R = 2T`
`t.= R/2 = 20/2 = 10 cm`
Hence, the focal length of the given spherical mirror is 10 cm.


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