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Question

Light of wavelength 500 nm traveling with a speed of 2.0×108ms1 in a certain medium enters another medium of refractive index 5/4 times that of the first medium. What are the wavelength and speed in the second medium?

A
400nm,1.6×108ms1
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B
400nm,2.5×108ms1
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C
500nm,2.5×108ms1
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D
625nm,1.6×108ms1
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