A concave mirror produces an image of an object such that the distance between the object and image is 20 cm . If the magnification of the image is ' -3 ', then the magnitude of the radius o

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A concave mirror produces an image of an object such that the distance between the object and image is 20 cm . If the magnification of the image is ' -3 ', then the magnitude of the radius of curvature of the mirror is :

TestHub · Accepted Answer

​ m = − 3 = − v u ​ u = − x v = − 3 x ⇒ 2 x = 20 cm ​ ​ x = 10 cm f = u + V u V ​ = ( − 10 ) + ( − 30 ) ( − 10 ) ( − 30 ) ​ = − 7.5 cm f = − 2 R ​ R = − 2 f = 15 cm ​

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