Question

(a) Write name of spherical mirror used as rear-view mirror in vehicles.
(b) An electric bulb is connected to a $220V$ generator. Write value of power of bulb if $0.5A$ current is flowing through the bulb.

Answer 1

A. Convex mirrors are used in vehicles because the images of behind cars they produce are virtual but still upright. That is, the image you see in your rearview mirror may be scaled differently, but it will not be flipped upside down. Convex mirrors work two ways. First, they can reflect parallel rays of light in such a way that they scatter in all directions. On the other hand, they can take light coming from various directions and reflect them so that they are parallel. It is this second method that is used in cars.

B. $P=VI⟹P=220\left(0.5\right)=110W.$