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# Question is in the image attached

Asked by swayamagarwal2114 15th July 2022, 9:18 AM
Let P is point of luminous source. Light ray from P incident on A is getting reflected first and
then at B is getting reflected second time and then reaches the source point P as shown in figure .

a is the distance from P to centre O and b is the distance from centre to the point
where reflected ray meets the diamenter through P .

Let us use the property of triangle as applied to ΔPQR as shown in figure.

If the line PS divides the base QR in the ration m : n and makes angle α , β and γ as shown in figure ,

then we have ,  ( m + n ) cotγ = m cotα - n cotβ

By using this property to ΔPAB as shown in left side of figure, we get

( a + b ) cotφ = (a-b) cotθ

it can be shown that φ = 90 - θ , hence cotφ = cot(90-θ) = tanθ

tan2θ = (a-b) / a+b

Answered by Expert 15th July 2022, 7:42 PM
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