An object is placed 18cm front of the mirror if the image is formed at 4cm to the right of the mirror.calculate the focal length is the mirror concave/convex?radius of the curavature? nature of image
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We generally take the light rays coming from left of mirror.
Given : u = -18 cm, v = 4 cm
By mirror formula ; 1/v + 1/u = 1/f
1/4 - 1/18 = (9 - 2) / 36 = 1/f
1/f = 7/36 , f = 36/7 cm, it is a convex mirror.
m = -v/u = 2/9, so the image is virtual, erect and diminished.
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