Question

Name an equipment where the following are used:
(a) A concave mirror
(b) A convex mirror

Answer 1

Hint: In order to answer this question, to name the equipment that uses the given types of mirror, we will first name the equipment and then we will describe the equipment uses and their implementations.

Complete answer:
(a) Satellite dishes use concave mirrored surfaces to receive and redirect signals. Headlights, flashlights, and camera flashes use concave mirrors to focus beams of light. A satellite dish is a parabolic antenna in the shape of a dish that is used to receive or broadcast data via radio waves to or from a communication satellite.

The phrase most frequently refers to a dish that receives direct-broadcast satellite television from a geostationary orbiting direct broadcast satellite. A dish's parabolic shape reflects the signal back to the focal point. A feedhorn is a device that is mounted on brackets at the focal point of the dish. This feedhorn is the front end of a waveguide that collects signals at or around the focal point and 'conducts' them to a low-noise block downconverter, or LNB.

The LNB translates electromagnetic or radio waves into electrical signals and transfers downlinked C-band and/or Ku-band communications to the L-band region. An LNBF, which combines the feedhorn and the LNB, is used in direct broadcast satellite dishes. The University of Waterloo unveiled in 2004 a new type of omnidirectional satellite antenna that does not require a directed parabolic dish and may be deployed on a movable platform such as a car.

(b) Convex mirrors are used in automobile side and rear view mirrors. Some cell phones are also equipped with these mirrors to aid users when performing a self-portrait shot. In cars and vehicles, a convex mirror is favoured as a rear-view mirror because it provides a broader field of view, allowing the driver to see the majority of the traffic behind him. Convex mirrors always reflect the objects in front of them in an erect, imaginary, and shrunken form.

Note:In exchange for a larger field of view, a convex mirror sacrifices accurate distance perception. A larger field of view also means a smaller blind spot than on the driver's side of the vehicle. These mirrors are normally seen on the vehicle's passenger side. They create little virtual representations of objects in the background of the vehicle. As a result, the side-view convex mirrors allow the driver to see what is behind the vehicle at all times.