Question
A ray of light of intensity I is incident on a parallel glass-slab at a point A as shown in fig. It undergoes partial reflection and refraction. At each reflection 25% of incident energy is reflected. The rays AB and AB undergo interference. The ratio 
is
- 4 : 1
- 8 : 1
- 7 : 1
- 49 : 1
The correct answer is: 49 : 1
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