Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): A combination of a thin convex lens of power +5 D and a thin concave lens of power -5 D placed in contact produces a linear magnification of +1 for any object distance. Reason (R): The effective power of this combination is zero, making it behave like a plane glass plate. In the light of the above

Step-by-step solution

The effective power of the lens combination is the algebraic sum of their individual powers: P_ net = P₁ + P₂ = +5 D + (-5 D ) = 0 D . Since P_ net = 0 , the effective focal length F = 1 P_ net = . A lens system with infinite focal length behaves like a plane glass plate. Reason (R) is correct. Using the lens formula, 1 v - 1 u = 1 F = 0 v = u . The linear magnification is m = v u = u u = +1 . Thus, the combination produces a magnification of +1 for any object distance. Assertion (A) is correct. Reason (R) provides