A student constructed a periscope by joining different periscopes P, Q, R, S and T as shown in the figure. Then,
(i) how many times does the incident light ray undergo reflection. (ii) when he observes the image of an object using only one periscope what kind of variation can be observed in the image, when compared with the image formed by the periscope shown in the figure?

Explanation

From the figure, the light rays from the object undergo reflection at each mirror surface and emerges out. Therefore, the light ray undergoes 10 reflections. (ii) When the student views the object through periscope .P., the image will be bright. Whereas, the intensity of image observed through the periscope formed by joining a number of periscopes is less due to large number of reflections at mirror surfaces.