Assertion A: Photodiodes are preferably operated in reverse bias condition for light intensity measurement.

Question

Given below are two statements: 

One is labelled as Assertion A and the other is labelled as Reason R.

Assertion A: Photodiodes are preferably operated in reverse bias condition for light intensity measurement.

Reason R: The current in the forward bias is more than the current in the reverse bias for a p – n junction diode. In the light of the above statement, choose the correct answer from the options given below :

(1) A is false but R is true

(2) Both A and R are true but R is NOT the correct explanation of A

(3) A is true but R is false

(4) Both A and R are true and R is the correct explanation of A

Answer 1

(2) Both A and R are true but R is NOT the correct explanation of A

Photodiodes are operated in reverse bias as fractional change in current due to light is more easy to detect in reverse bias.