Question

When a beam of light is allowed to pass through a transparent medium, the rate of decrease of intensity with the thickness of medium is __________ to the intensity of the light.

(a) inversely proportional

(b) directly proportional

(c) equal

(d) not related

I have been asked this question during an internship interview.

My enquiry is from Laws of Photochemistry in portion Photochemistry of Engineering Chemistry I

Answer 1

Right option is (b) directly proportional

Best explanation: As per Lambert’s law, when a beam of light passes through a transparent medium, the rate of decrease of intensity with the thickness of medium is directly proportional to the intensity of the light. Mathematically, it may be stated as follows: -dI/t=kI.