How are the two plane mirrors in a periscope arranged:
(a) with respect to one another?
(b) with respect to sides of the tube?
A periscope is defined as an instrument used for observing over, around or through an obstacle or object which is prevented by a direct line of sight.
i) The two plane mirrors in a periscope arranged with respect to one another are parallel to one another inside the periscope as it reflects the light rays from the upper end of the periscope to the lower end of the periscope. Their reflecting surfaces face each other.
ii) The two plane mirrors in a periscope arranged with respect to one another at an angle of 45 degrees with respect to the sides of the tubes as, the angle of inclination easily helps the propagation of light rays through the inner gap of the periscope, hindering reflections on any wrong part.