Question

How are infrared radiations useful to human beings

Answer 1

One of the most common uses of infrared radiation is in heat-sensitive thermal imaging cameras. These can be used to study human and animal body heat patterns

Most remote controls operate by sending pulses of infrared, spelling out codes that an electronic device will recognize. This includes TV remotes, DVD players, projectors

Infrared is also widely used in astronomy. Taking pictures of the universe in infrared can lead to some amazing discoveries.

Infrared is often used to send signals through fiber optic cables, particularly when using standard silica fibers. Fiber optic cables are commonly used to transmit audio to sound systems and for high-speed Internet connections.