(iv) Which of the following statement is wrong?
1. Speed of light ray PQ is equal to the speed of light ray QD.
2. Speed of light ray PQ is equal to the speed of light ray RS.
3. Speed of light ray QD is greater than the speed of light ray DR.
4. Speed of light ray PQ is greater than the speed of light ray RS.
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Answer:
3 is wrong
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