The image of an object formed by a mirror is real, inverted and is of magnification -1. If the image is at a distance of 40cm from the mirror, where is the object placed, where could the image be if the object is moved 20cm towards the mirror, state reason and draw a ray diagram.
Answers
Answered by
356
the magnification is -1 means the image is real and inverted and is of the same size as that of the object.
so if the image is at a distance of 40cm from the mirror then the object is also at a distance of 40cm from the mirror (because the object is placed at C ie center of curvature of the mirror.
if the object is moved 20cm towards the mirror the object is placed at F ie at the principal focus and the image is formed at infinity.
the nature of the mage so formed is real inverted and highly enlarged.
(NOTE draw the ray diagran for an object placed at F for a concave mirror)
so if the image is at a distance of 40cm from the mirror then the object is also at a distance of 40cm from the mirror (because the object is placed at C ie center of curvature of the mirror.
if the object is moved 20cm towards the mirror the object is placed at F ie at the principal focus and the image is formed at infinity.
the nature of the mage so formed is real inverted and highly enlarged.
(NOTE draw the ray diagran for an object placed at F for a concave mirror)
Similar questions