In Bunsen's grease spot photometer, light from a lamp with dirty chimney is exactly
Channel: Doubtnut
Date: 2021-11-02

In Bunsen's grease spot photometer, light from a lamp with dirty chimney is exactly balanced by that of a candle distant 10 cm from the spot. When the chimney is cleaned, the candle has to be shifted by 2 cm to obtain the balance. Calculate the percentage of light absorbed by dirty chimney.