Question

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 40 cm from the mirror.where is the object placed.where would the image be if the object is moved 20 cm towards the mirror? State the reason and also draw a ray diagram for the new position of the object to justify your answer

Answer 1

given
m= -1
u= 40
it is concave mirror so,
u= -40


so, m= - v/u
now u will put the value and find.


now object is moved 20cm towards mirror
then new u= -40 - (-20)=-20
now u can find