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Question


A light ray enters a prism through the side PR. PQR is a cross section of the prism. The emergent ray lies along the boundary OQ. ∠P = 90° and PQ = PR. The ray diagram has been given.

iv. What is the speed of light in the prism? (Speed of light in air is 3×108 m/s)

[1 mark]

A
3×108 m/s
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B
2.1×108 m/s
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C
1.4×108 m/s
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D
1.2×108 m/s
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