The energy propagated from body can be determined by
Q = h*c / ?. From this, wave length can be determined by having an energy value. This help in determination of wavelength by using plank?s constant.

Panchromatic sensor is placed on boards of IRS 1C and 1D. This is having capability of handling only a single band which will be any of waves in EM spectrum.

Electromagnetic spectrum consists of a wide range of classifications among those some of m are absorbed by atmosphere and most of m are used in remote sensing those include visible rays, IR rays, Radar waves, Radio waves etc.

The EM field consists of electric and magnetic fields. Each of m plays a major role in ir perspective areas. The placement of electric and magnetic fields depends up on intensity of wave length. Electric fields are placed in vertical manner and magnetic field in a horizontal manner.

Sun is most prominent star among all stars available. The radiation emitted by sun can used in case of passive remote sensing. The diameter of sun can be estimated as 1.39 * 10⁶ km.

Visible region consist of three color waves red, blue and green remaining are combination of those. The blue light is having a wavelength range of 0.42-0.52 micrometer.

The energy of wavelength can be expressed by using energy balance equation, which is given as E_? = E_R?+E_A?+E_T?. On substitution, we get
E_? = 56+24+7
E_? = 87J.

The electromagnetic waves while travelling from source to object under goes interaction with atmosphere. During this interaction, EM waves will undergo scattering, refraction due to this it can undergo loss in information.

Remote sensing can be defined as process of obtaining information without any contact with object. In this process, it undergoes several steps for obtaining required output. They include energy source, propagation of energy, interaction of energy, reflectance of energy, transmission and usage of data.

Infrared region has been classified into rmal IR and reflected IR. Thermal IR is equipped with optical mechanical scanner and a special system which is free from a film produces images by using wavelengths of range 3-5 micrometer.