A moth is at a distance of 10cm in front of a plane mirror. An observer is standing at a distance of 30cm in front of the mirror. Calculate the distance between the observer and the position of the moth's image.
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Solution
For a plane mirror, the image distance = the object distance from the mirror.
Given, the moth is 10cm in front of the mirror. So, the image of the moth is formed 10cm behind the mirror.
The observer is standing at a distance of 30cm in front of the mirror.
That is, the distance between the observer and the mirror is 30cm.
Therefore, the distance between the moth's image and the observer is 30cm+10cm=40cm.