Question -
Choose the type of prism which was used in Biot's experiment.
Options:
A .  Glass
B .  Nicol
C .  Sodium
D .  Diamond
Answer: Option B : B The type of prism used in Biot’s experiment is called a Nicol prism. This is a special material which is able to polarise light passing through it. You know that light normally vibrates in all possible planes when coming out of a source. But when passed through special devices like this Nicol prism it comes out vibrating in just one direction. This allows us to test for optical activity.
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