Question

8. An object is placed 20 cm in front of a plane mirror. The mirror is moved 2 cm towards the ant object. The distance between the positions of the original and final images seen in the mirror is (a) 2 cm (b) 4 cm (c) 10 cm (d) 22 cm​

Answer 1

Answer:

4cm

Explanation:

The plane mirror being moved 2cm nearer the object predicts the image to move 2×2=4cm ahead of the original image. Other wise the initial position of image was at 2×20cm from the object. As the mirror moved 2cm towards the object its new distance from mirror becomes 18cm.Then, the new distance of image from object becomes 2×18=36cm.Hence the distance betwen the two images=(40–36)cm=4cm.Ans