Assertion ( A ): CRT is the most important component of a CRO.
Reason ( R ): When an electron beam strikes the screen of CRT, a spot of light is produced.
A. Both A and R are true and R is correct explanation of A
B. Both A and R are true but R is not correct explanation of A
C. A is true R is false
D. A is false R is true
Share your understanding of this question with the correct explanation.