Assertion : The distance between the Focus and pole of a spherical mirror is called the radius of curvature. Reason : The radius of curvature of a spherical mirror is the radius of the circle of which the spherical mirror is a part A - Both A and R are true and R is the correct explanation of A. B - Both A and R are true but R is NOT the correct explanation of A. C - A is true but R is false. D - A is false but R is true. E - Both A and R are false. Assertion : The distance between the Focus and pole of a spherical lens is called the radius of curvature. Reason : The radius of curvature of a spherical mirror is the radius of the circle of which the spherical mirror is a part