A convex mirror has radius of curvature of 20cm . An object is placed at such a distance from the mirror that the size of image is exactly half that of the object. The object must be at :-

Question

A convex mirror has radius of curvature of 20cm . An object is placed at such a distance from the mirror that the size of image is exactly half that of the object. The object must be at :- (A) 20cm (B) 30cm (C) 10cm (D) 40cm

Tardigrade Admin · Accepted Answer

f=10,m=(f/f - u) m=(1/2)⇒ u=-10

Q. A convex mirror has radius of curvature of $20 c m$ . An object is placed at such a distance from the mirror that the size of image is exactly half that of the object. The object must be at :-

$20 c m$

$30 c m$

$10 c m$

$40 c m$

$f = 10, m = \frac{f}{f - u}$
$m = \frac{1}{2} \Rightarrow u = - 10$

Q. A convex mirror has radius of curvature of 20cm . An object is placed at such a distance from the mirror that the size of image is exactly half that of the object. The object must be at :-

20cm

30cm

10cm

40cm