How are the two planes mirrors in a periscope arranged:

(a) with respect to one another ?

(b) with respect to sides of the tube ?

Q. How many plane mirrors are used in a periscope ? How are they arranged relative to each other ?

Q.

A device which works on the reflection of light from two plane mirrors arranged parallel to one another is:

(a) electroscope

(b) kaleidoscope

(c) periscope

(d) stethoscope

Q. Two plane mirrors are arranged parallel to one another each moving with a speed $u$ as shown in figure. The linear velocity of the $N^{th}$ image formed by mirror, of a point object (w.r.t object), considering the first reflection takes place at mirror $1$ is :

Q. A device that works using the reflection of light from two plane mirrors arranged parallel to one another is: