(A) The focal length of lens changes when red light is replaced by blue light ( R) The focal length of lens does not depend on colour of light speed.

(A) The focal length of lens changes when red light is replaced by blu

1.	(A) The focal length of lens changes when red light is replaced by blue light ( R) The focal length of lens does not depend on colour of light speed.
Answer» Both A and R are TRUE and R is the correct explanation of A Both A and R are true and R is not the correct explanation of A A is true and R is false Both A and R is false Answer :C