Question

Name the rays or waves used for taking photographs in dark.
A. Infrared rays
B. Ultraviolet rays
C. X-rays
D. Gamma rays

Answer 1

Check the properties of the rays in the electromagnetic spectrum.
Also check the rays which can also be used in the dark.

Complete step by step answer:
The photographers use the cameras which are sensitive to visible light to take the photographs in the visible light or daylight.
The photographs which are taken in the dark are taken with the cameras which are sensitive to the infrared rays and photographs can be taken in the absence of the visible light also.
The infrared ray sensitive camera has the ability to focus differently as the wavelength of the infrared rays is longer than the visible light.
The infrared radiations are emitted by the bodies all the time.
Therefore, the rays used for taking photographs in the dark are infrared rays and not ultraviolet rays.
Hence, option B is incorrect.

The photographers use the cameras which are sensitive to visible light to take the photographs in the visible light or daylight.
The photographs which are taken in the dark are taken with the cameras which are sensitive to the infrared rays and photographs can be taken in the absence of the visible light also.
The infrared ray sensitive camera has the ability to focus differently as the wavelength of the infrared rays is longer than the visible light.
The infrared radiations are emitted by the bodies all the time.
Therefore, the rays used for taking photographs in the dark are infrared rays and not X-rays.
Hence, the option C is incorrect.

The photographers use the cameras which are sensitive to visible light to take the photographs in the visible light or daylight.
The photographs which are taken in the dark are taken with the cameras which are sensitive to the infrared rays and photographs can be taken in the absence of the visible light also.
The infrared ray sensitive camera has the ability to focus differently as the wavelength of the infrared rays is longer than the visible light.
The infrared radiations are emitted by the bodies all the time.
Therefore, the rays used for taking photographs in the dark are infrared rays and not gamma rays.
Hence, the option D is incorrect.

The photographers use the cameras which are sensitive to visible light to take the photographs in the visible light or daylight.
The infrared ray sensitive camera has the ability to focus differently as the wavelength of the infrared rays is longer than the visible light.
The infrared radiations are emitted by the bodies all the time.
Therefore, the rays used for taking photographs in the dark are infrared rays.

So, the correct answer is “Option A”.

Note:
Ultraviolet rays can also be used in photography.
The photographs which are taken in the dark are taken with the cameras which are sensitive to the infrared rays and photographs can be taken in the absence of the visible light also.