A Beam of Light in Air Is Incident on the Surface

question 63

Multiple Choice

A beam of light in air is incident on the surface of a rectangular block of clear plastic (n = 1.49) .If the velocity of the beam before it enters the plastic is 3.00 × 10⁸ m/s,what is its velocity inside the block?

• A)3.00E+8 m/s
• B)1.35E+8 m/s
• C)2.01E+8 m/s
• D)2.46E+8 m/s
• E)1.53E+8 m/s

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