`{:("Column I","Column II"),((A)" An object is placed at a distance equal to focal length from pole before convex mirror",(p)" Magnification is "(infty)),((B)" An object is placed at focus before a concave mirror",(q)" Magnification is (0.5)"),((C) "An object is placed at the centre of curvature before a concave mirror" , (r) "Magnification is (1//3)") , ((D) " An object is placed at a distance equal to radius of curvature before a convex mirror" , (s) "Magnification is (-1)"):}`

Answer

(A)-q (B)-p (C)-s (D)-r

Explanation

m= `(f)/(f-u)`
(A) Convex mirror u=-ve ,f=+ve
`m = (f)/(f-(f)) = (1)/(2)`
(B) Concave `rarr m = (-f)/(-f-(-f))= oo`
(C) Concave mirror u= - R(2f)
`m = (-f)/(-f-(-2f)) = (-f)/(f) = -1`
(D) Convex mirror u=-2f
`m = (f)/(f-(-2f)) = (f)/(3f) = (1)/(3)`