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Constructive interference occur when total phase change after two successive reflections at upper and lower interfaces is equal to? (Where m is integer)

Optoelectronics and Optical Communication 

Constructive interference occur when total phase change after two successive reflections at upper and lower interfaces is equal to? (Where m is integer)

a) 2Πm 
b) Πm 
c) Πm/4 
d) Πm/6








Answer : - 2Πm

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