An object is placed 10 cm in front of a plane mirror. The mirror is moved 1 cm towards the object. The distance between the positions of the original and final images seen in the mirror is :2 cm4 cm10 cm22 cm
Question
An object is placed 10 cm in front of a plane mirror. The mirror is moved 1 cm towards the object. The distance between the positions of the original and final images seen in the mirror is :2 cm4 cm10 cm22 cm
Solution
The image formed by a plane mirror is always the same distance behind the mirror as the object is in front of the mirror. So initially, the image is 10 cm behind the mirror.
When the mirror is moved 1 cm towards the object, the object is now 9 cm in front of the mirror, so the new image is 9 cm behind the mirror.
The distance between the original and final images is the sum of these two distances, which is 10 cm + 9 cm = 19 cm. However, this option is not given in the question. The question might have a mistake.
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