Question

Give four uses of Infra-red rays.

Answer 1

they are used to study human and animal body heat patterns
2)they are also used as night vision cameras
3)used in thermistor
I hope it helps you!!!!!!!
STUDY HARD

Answer 2

1) One of the most common uses of infrared radiation is in heat-sensitive thermal imaging cameras.
2) These can be used to study human and animal body heat patterns, but more often, they are used as night-vision cameras. 
3) 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, etc.
4) 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.