A man having height 6 m. He observes image of 2 m height erect, then mirror used is(a) Concave
(b) Convex(c) Plane(d) None of these
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answer : (a) convex mirror
explanation : height of man {object } , h = 6m
height of image , h' = +2m [ because image is virtual so, positive sign]
now, magnification , m = height of image/height of object
= +2m/6m = +1/3 < 1
here it is clear that , magnification is positive but less than 1 so, mirror is not other than convex mirror. because we know, a concave mirror only forms magnified virtual image.
explanation : height of man {object } , h = 6m
height of image , h' = +2m [ because image is virtual so, positive sign]
now, magnification , m = height of image/height of object
= +2m/6m = +1/3 < 1
here it is clear that , magnification is positive but less than 1 so, mirror is not other than convex mirror. because we know, a concave mirror only forms magnified virtual image.
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