Question

How does a mirror galvanometer work?

Answer 1

Explanation:

1. An ammeter that detects an electric current by deflecting a light beam with a mirror is known as a mirror galvanometer. A scale's projected light beam serves as a protracted, massless pointer.
2. Galvanometer: a device that uses the motion of a coil to measure a very small electrical current or a function of the current. The current's forces generate mechanical rotational forces that cause the deflection.

Mirror galvanometer work:

1. The scale has an aperture that faces the mirror of the galvanometer and is illuminated by a lamp that is placed behind the scale.
2. When an electric current bends the magnet/mirror, the light bends along with it and is measured by the scale. The mirror reflects that light back onto the scale.

Hence, an ammeter called a mirror galvanometer uses a mirror to deflect a light beam in order to measure an electric current. When a light beam is reflected off of a mirror, it is said to have been deflected.

To show the deflection, the mirror galvanometer scale functions as a long massless pointer.