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  4. Two plane mirrors are kept parallel at 20 cm from each other. A point object O is placed exactly in between them. Calculate distance between second images formed by two mirrors. <img class=img-fluid question-image alt=Question src=https://cdn.tardigrade.in/q/nta/p-qyk3p08yv8sv.png />

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Q. Two plane mirrors are kept parallel at $20 \, cm$ from each other. A point object $O$ is placed exactly in between them. Calculate distance between second images formed by two mirrors.

Question

NTA AbhyasNTA Abhyas 2020Ray Optics and Optical Instruments

Solution:

Solution
From the diagram it is clear that Distance between $I_{2}\&\text{I}_{2}^{'}$
$=\left(\right.30 \, + \, 20 \, + \, 30\left.\right) \, cm=80 \, cm$