application of photocells in auto lamps

A photocell converts the change in the intensity of light into a change in the electric current. The diagram shows a photocell circuit. The cathode is made of photosensitive materia..

Photocells are used in television camera to reproduce sound recorded on films, in counting devices, in burglar and fire alarms, to measure the temperature of stars, to study the spectrum of heavy bodies, to operate street light, to compare the illuminating powers of two sources, in photom..

Applications of Spherical Mirrors - A convex mirror is used as a rear view mirror in vehicles as images are small, erect. This gives us a wider view of the traffic behind. Convex mirrors are also used in reflecting telescopes. They are also used as reflectors in street lamps, as..

In the manufacture of sodium peroxide, sodamide, sodium cyanide etc. About 50 per cent of sodium extracted is used in the manufacture of tetraethyl lead (C 2 H 5 ) 4 Pb), which is used as anti-knock agent in petrol. For producing amalgams and alloys. Amalgams are used as reducing agents. So..

> In a concave mirror, magnification can be both positive or negative, depending on the type of image formed (virtual or real). Other formulae for magnification are Spherical mirrors have several applications. A convex mirror is used as reflector in street lamps. It is also used..