4. The bisectors of angleP and angleR of a cyclic quadrilateral
PQRS meet at X. PX produced meets the circle at Y.
Prove that angleXRY = 90°.
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This relationship between the angles of incidence and refraction and the indices of refraction of the two media is known as Snell's Law.Sohgaura copper-plate inscription
Sohgaura copper-plate inscription is an Indian copper plate inscription written in Prakrit language and in the Brahmi script and is possibly from the 3rd century Mauryan Empire. It is actually written on a small plaque of bronze (a copper alloy).
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