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A ray of light intensity I is incident o...

A ray of light intensity I is incident on a parallel glass-slab at a point `A` as shown in figure. It undergoes partial reflection and refraction. At each reflection `25%` of incident energy is reflected. The rays `AB` and `A^(')B^(')` undergo interference. The ratio `I_(max)//I_(min)` is

A

`49:1`

B

`7:1`

C

`4:1`

D

`8:1`

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