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A spherical surface of radius R separate...

A spherical surface of radius R separates air from a medium of refractive index `mu`. Parallel beam of light is incident, from medium side, making a small angle `theta` with the principal axis of the spherical surface. Find the co-ordinates of the point where the rays will focus in air.

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The correct Answer is:
`x = (R)/(mu-1); y = R ((mu)/(mu-1))`
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