Question

Consider a beam of light passing through a 1 cm cuvette containing 1mg/liter of a light absorbing compound. Suppose 20% of the incident light is absorbed. Now place a second identical cuvette in the light path directly behind the first cuvette. What is the intensity of the light transmitted through both cuvettes – you can answer in percentage amount of light.

Answer 1

Ans)80% light is transmitted through ist cuvette while

64% light is transmitted through second cuvette

Explaination:

Let initial light intensity is 100% then after passing through ist cuvette 20% light is absorbed while (100-20=80%) 80% is transmitted through ist cuvette.

Now place second cuvette the intensity of light now passing through second cuvette is 80% so after passing 20% of 80% is absorbed ie. 20x80/100=16% is absorbed while remaining (80-16=64%)64% light is transmitted through second cuvette.