Question

plz solve this
An object is placed at a distance of 30 cm from the pole of a concave mirror of focal length 15 cm . Find the position of the image . what is its magnitude???

Answer 1

the image is virtual,erect,The distance of the object from the mirror is twice the focal length and hence the image would be at the same position as the object.

Answer 2

take u = -30 cm
f = -15 cm
1/v = 1/f -1/u = -1/15+1/30
= -30+15/15*30
=-15/450
v = 450/15 = -30cm
image formed 30 CM in front of mirror
I. e if object placed at twice the focal length image will be formed at same place.
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