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. [Ans. 70 cm] (b) distance between two positions of the image. [Ans. 30 cm]
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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 -36d=40−36
d = 4 cmd=4cm
Hence, The total distance between the positions of the original and final image is 4 cm.
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