21. If a wave hits a smooth surface at an angle of incidence of 40 degrees, the angle of reflection is
A. 0 degrees.
B. 90 degrees.
C. 40 degrees.
D. 80 degrees.

21. If a wave hits a smooth surface at an angle of incidence of 40 degrees, the angle of reflection is
A. 0 degrees.
B. 90 degrees.
C. 40 degrees.
D. 80 degrees.

If a wave hits a smooth surface at an angle of incidence of 40 degrees, the angle of reflection is 40 DEGREES.

21. If a wave hits a smooth surface at an angle of incidence of 40 degrees, the angle of reflection is A. 0 degrees. B. 90 degrees. C. 40 degrees. D. 80 degrees.

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