Question

Explain the following:-
A Rock salt prism is used instead of a glass to obtain the infrared spectrum

Answer 1

Hint : Electromagnetic waves also called electromagnetic radiation are basically defined as superimposed oscillation of an electric and magnetic field in space with their direction of propagation perpendicular to both of them. Simple words electromagnetic waves are oscillation produced due to crossing over an electric and a magnetic field
The direction of propagation of such wave is perpendicular to the direction of the force of either of these field as seen in the above figure, like all waveform these have some properties of electromagnetic wave propagation

Complete solutions:-
Infrared spectrum can be obtained only with the help of a rock salt prism since the rock salt prism does not absorb infrared radiation whereas glass prisms absorb them. Electromagnetic wave also called radiation are basically as superimposed oscillations of an electric and magnetic field in space

Note: The wavelength $\left( {{\lambda }} \right)$and frequency (V) of the EM wave can be related as ${\text{C = V}}{{.\lambda }}$
Where C= velocity of wave
To study electromagnetic wave propagation. Let X Ray are electromagnetic waves having a wavelength range of 0.001 Nanometer to 10 Nanometer, they find a variety of application ranging from medical purpose like electron of anatomy inside the body, security at airport or public places x-ray are generated inside an x-ray tube which is nothing but a tube with the vacuum that has a high potential difference at its and does causes a stream of high velocity electron to hit a target anode mostly tungsten or another metal depending on the type of wavelength require. The infrared spectrum can be obtained only with the help of rock salt prism.