20 Which of the following is NOT correct?
a. light is a longitudinal wave
b. light is a tranverse wave
c. light is an electromagnetic wave
d. light can exhibit the phenomenon of polarisation
21 Light is a form of energy that -------
a. is transported from place to place due to the temperature gradient
b. requires material media for its propagation
c. stimulates the sensation of sight
d. cannot be difrracted
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