Question

An object is placed 20 cm in front of a plane mirror.The mirror is moved 2 cm towards the object.The distance between the positions of the original and final images seen in the mirror

Answer 1

Answer: The total distance between the positions of the original and final image is 4 cm.

Explanation:

We know that,

For plane mirror,

The image distance = - The object distance

An object is placed 20 cm in front of a plane mirror then the image is formed at 20 cm behind the mirror.

If the mirror is moved 2 cm toward the object.

The distance between object and mirror = 20-2 = 18 cm

The distance between image and mirror = 20-2 = 18 cm

Therefore, the total distance between the positions of the original and final image is

d = distance of the original image - distance of the final image

$d =40 -36$

$d = 4 cm$

Hence, The total distance between the positions of the original and final image is 4 cm.

Answer 2

Answer: The total distance between the positions of the original and final image is 4 cm.

Explanation:

We know that,

For plane mirror,

The image distance = - The object distance

An object is placed 20 cm in front of a plane mirror then the image is formed at 20 cm behind the mirror.

If the mirror is moved 2 cm toward the object.

The distance between object and mirror = 20-2 = 18 cm

The distance between image and mirror = 20-2 = 18 cm

Therefore, the total distance between the positions of the original and final image is

d = distance of the original image - distance of the final image

Hence, The total distance between the positions of the original and final image is 4 cm.