question_answer

A ray of light of intensity I is incident on a parallel glass slab at point A as shown in diagram. 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 of\[{{I}_{\max }}\]and\[{{I}_{\min }}\]is:     

A) 49 : 1

B) 7 : 1  

C) 4 : 1  

D) 8 : 1