18. Deduce the laws of reflection on the basis of Huygens wave theory.
19. The fringe width in Young's double split experiment interference pattern is 2.4 x 10-4 m, when
light of wavelength 6400 Aº is used. By how much will the fringe width changed if blue light of
wavelength 4000Aº is used?
Section-E: Carrying Five marks each
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