Скачать или смотреть How to find the positions of images in two parallel mirrors?

Two plane mirrors A and B are arranged parallely with their reflecting surfaces facing each other. A point object is placed in between them as shown in the figure. The distance between 2nd image formed by A and 3rd image formed by B is

(1) 40 cm (2) 60 cm
(3) 80 cm (4) 90 cm

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