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

Q.

The device used for detecting charge (positive or negative) on an object is called:

(a) stethoscope (b) telescope (c) kaleidoscope (d) electroscope

Q.

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. Which of the following device does not work on the multiple reflections of sound waves ?
(a) stethoscope
(b) hydrophone
(c) soundboard
(d) megaphone

Q. A light beam is being reflected by using two mirrors,as in a periscope used in submarines.if one of the mirrors rotates by an angle $\theta$, the reflected light will deviate from its original path by the angle