1) A parallel beam of light of intensity I0 is incident on a coated glass plate. If 25% of the incident light is reflected from the upper surface and 50% of light is reflected from the lower surface of the glass plate, the ratio of maximum to minimum intensity in the interference region of the reflected light is A) (12+√3812−√38)2 B) (14+√3812−√38)2 C) 58 D) 85 Answer: Option AExplanation: According to question , we can draw the following diagram I1=I04⇒I2=38I0 We know that, ImaxImin= (√I1+√I2)2(√I1−√I2)2=(12+√3812−√38)2