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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