Question

An image is formed 20 cm from a convex mirror of radius 30 cm. Where was the object placed?

Answer 1

Answer:

Explanation:

acc to given criteria

object  distance frm convex mirror = 20 cm

radius  of curvature of convex mirror = 30 cm

focal length of convex mirror  f = r/2 =  30/2= 15cm

now applying mirror formula

1/f= 1/v + 1/u

1/15 = 1/v + 1/- 20

1/v = 1/15+ 1/20=

So the distance is formed on the opposite side of the object at a distance of 10 cm from the mirror

The distance between object and image is u+v =15 +  =

When plane mirror is placed in front of object and in order to get image at same position as convex mirror, the mirror should be place at  

2

30

​  

=15cm, as in plane mirror the object distance from mirror is equal to image distance from

Answer 2

Explanation:

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