Optics 7 Question 23

23. The phases of the light wave at c,d,e and f are φc,φd,φe and φf respectively. It is given that φcφf

(2007,4M)

(a) φc cannot be equal to φd

(b) φd can be equal to φe

(c) (φdφf) is equal to (φcφe)

(d) (φdφc) is not equal to (φfφe)

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Solution:

  1. All points on a wavefront are at the same phase.

φd=φc and φf=φeφdφf=φcφe



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