A) a photon
B) an electron
C) a new source of wave
D) neutron
Correct Answer: C
Solution :
In 1678, Huygen proposed the wave theory of light. According to Huygen light travels in the form of waves, when waves spread out from a source in a medium, the medium particles are set in oscillation. Every particle of the medium situated on the wave front becomes a new wave source from which new waves spread in all directions. These waves are called secondary wavelets which advance in the medium with speed of original wave.
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