A ray of light intensity I is incident on a parallel glass-slab at a point `A` as shown in figure
Channel: Doubtnut
Date: 2021-11-08

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