What is the speed of light?

Light travels in the form of straight line. Light travels. with constant speed in the vacuum and this constant speed is equal to. the c = 2 9979245 times 10^8 m s-1.

When the light reflected from the medium or the surface, the angle of reflection depends only on the angle of incidence to the surface. According to the law of reflection, the angle of reflected wave reflected from the surface is always equal to the angle of incidence. Superposition: If. in the space multiple light waves are present then at a particular. point in the space the resultant electric field would be the vector sum. of the all the electric fields present at that point. This is the law of. superposition. As light consists of electric and magnetic field, the. law of superposition is followed by both electric and magnetic fields. and we get the resultant magnetic and electric fields at that point . . Refraction: When. light passes through a substance or medium, light gets bend on the. basis of the wavelength or frequency. This phenomenon is termed as the. Refraction. It follows Snells Law of Refraction. . Light Transmittance : When. light falls on a substance, some of the light energy gets refracted,. some gets refracted, and some gets absorbed by the substance. Light. transmittance is defined as the fraction of incident light on the. substance which passes through the substance at a particular frequency. or wavelength Light transmittance is defined as the ratio of the. intensity of the Incident light on the substance to the intensity of. light which passes through the substance or comes out from the. substance. . . Wavelength: Wavelength of Light is defined. as the distance between the two consecutive crests or between two. consecutive troughs. Wavelength of the light ranges from 380nm to 750nm. In the electromagnetic spectrum, Infrared rays has higher wavelength. than the visible rays and the ultraviolet rays has smaller wavelength as. compared to the light . . Frequency: Frequency of light. is defined as the number of crests which passes through a particular. point in a second. It’s represented in hertz. Frequency of waves is. inversely proportional to their wavelength, which means that higher the. wavelength, lower is the frequency and vice versa. The frequency range. of the light is between 400 to 790 THz. . Colors in light: Light. consist of different types of colors. These colors are. differentiated on the basis of their wavelengths in the visible spectrum. . For example, when visible white light is made to pass through the. prism, the different colors present in the visible white light bend at. different angles depending on their wavelengths and as a result. different colors of light are observed T he colors present in the light are Red, orange, yellow, green, and cyan, blue, violet Light is radiant energy, an electromagnetic radiation that’s visible to the human eye, and is responsible for the sense of sight. It’s the most popular form of energy, the wavelengths visible to humans range between 380nm (nanometers) to 740nm. It takes about seven minutes for light from the Sun to reach Earth. There are many sources of light a natural source of light is the sun as it plays an important role in our daily lives. Light behaves as a wave – it undergoes reflection, refraction, and diffraction just like any wave would. The details about this energy form are discussed in detail.

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