A ray of light of intensity I is incident on a parallel glass-slab at the point A and it undergoes partial reflection and refraction as shown in the figure. At each reflection, 25% of the incident energy is reflected and the rest is transmitted. If the rays AB and A’B’ undergo interference, then the ratio 
is
Text Solution
Verified by ExpertsThe correct answer is:
D
49 : 1
From figure 
and 
By using 
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