Question

An object is placed at 20 cm in front of a plane mirror the mirror is moved 15 cm away from the object find the:
(a) distance between the object and image.
(b) distance between two positions of the image.

Answer 1

(a) Distance between the object and image:
1-Distance between the object and the image is same in case of a plane mirror.
2-Distance of object is $20cm$ hence the distance of image is also equal to $20cm.$

(b) Distance between two positions of the image:
The distance between two positions of the image after the mirror is moved 15 CM away from the object is shown by the diagram as follows.
The distance between two positions of the images $30cm.$

Hence,Hence ,distance between the object and image is $70cm$ and distance between two positions of the image is $30cm.$