Question

The image of an object formed by a mirror is real, inverted and is magnification is -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 in mirror? state the reason and also draw the ray diagram for the new position of the object to justify your answer.

Answer 1

the objest is placed at 40cm . the image will be at infinity because in the first part to get magnifications 1 we have to place the at centre of curvature .ATQ 40-20 =20 which is 1/2 of 40 and 1/2 of center of curvature is focus if object is placed at focus then image will be formed at infinity