Cahaya adalah energi berbentuk gelo

Cahaya adalah energi berbentuk gelombang elektromagnetik yang kasat mata dengan panjang gelombang sekitar 380–750 nm. Pada bidang fisika, cahaya adalah radiasi elektromagnetik, baik dengan panjang gelombang kasat mata maupun yang tidak. Cahaya adalah paket partikel yang disebut foton.
Kedua definisi di atas adalah sifat yang ditunjukkan cahaya secara bersamaan sehingga disebut "dualisme gelombang-partikel". Paket cahaya yang disebut spektrum kemudian dipersepsikan secara visual oleh indera penglihatan sebagai warna.
berikut ini beberapa teori tentang pengertian cahaya:
1. Teori Korpuskuler (Newton)
Cahaya adalah korpuskel–korpuskel yang dipancarkan oleh sumber dan merambat lurus dengan kecepatan besar. Teori ini tidak dapat menerangkan peristiwa interferensi.

2. Teori Gelombang Elektromagnetik (Maxwell)
Cahaya adalah gelombang elektromagnetik berasal dari medan listrik dan medan magnet,bergerak dengan kecepatan 3×108 m/s.
3. Teori Undulasi (Christian Huygens)
Cahaya adalah gelombang yang berasal dari sumber yang bergetar, merambat dalam medium “eter”. Teori ini dapat menjelaskan peristiwa difraksi, interferensi dan polarisasi tetapi tidak dapatmenerangkan perambatan cahaya lurus.

Adapun sifat-sifat cahaya itu sendiri antara lain:
1. Dapat merambat dalam ruang hampa (tidak perlu medium untuk merambat).
2. Tidak bermuatan listrik.
3. Merupakan gelombang transversal (arah getarnya tegak lurus dengan arah perambatannya).
4. Arah perambatannya tidak dapat dibelokkan pada medan listrik maupun medan magnet.
5. Memiliki sifat umum seperti mengalami polarisasi, pemantulan (refleksi), pembiasan (refraksi), intervensi, dan pelenturan (difraksi).

Polarisasi atau pengkutuban adalah peristiwa penyerapan arah bidang getar dari gelombang. Polarisasi cahaya atau polarisasi optik adalah salah satu sifat cahaya yang bergerak secara oscillasi dan menuju arah tertentu. Karena cahaya termasuk gelombang elektromagnetik, maka cahaya ini mempunyai medan listrik, E dan juga medan magnet, H yang keduanya saling beroscilasi dan saling tegak lurus satu sama lain, serta tegak lurus terhadap arah rambatan (lihat gambar).

Hasil (Inggris) 1:

Light is an electromagnetic wave-shaped energy visible wavelengths approximately 380-750 nm. In physics, light is electromagnetic radiation with a wavelength, whether visible or not. Light is a particle called the photon packet.Both of the above definition is shown simultaneously so that the light is called the "wave-particle duality". Packets of light called the spectrum then are perceived visually by the sense of sight as the color.Here are some theories about the sense of light:1. The theory of Korpuskuler (Newton)Korpuskel – korpuskel light is emitted by the source and propagate with the speed of a large straight. This theory cannot explain the events of interference.2. The theory of electromagnetic waves (Maxwell)Light is electromagnetic waves coming from the electric field and magnetic field, moving with a speed of 3 × 108 m/s.3. Theory of Undulasi (Christian Huygens)Light is a wave that comes from a source which vibrates, propagate in a medium "ether". This theory may explain the events of the diffraction and polarization interference, but not dapatmenerangkan the propagation of light straight.As for the nature of light itself, among others:1. Can propagate in a vacuum (don't need a medium to propagate).2. Not electrically charged.3. A transversal waves (direction getarnya perpendicular to the direction of perambatannya).4. The direction perambatannya can not be deflected by an electric field and a magnetic field.5. Have General properties such as polarization, experiencing reflection (reflection), refraction (refraction), interventions, and metabolism (diffraction).Polarization or pengkutuban is the event of the vibrating field direction of the absorption of the wave. Polarization of light or optical polarization is one of the properties of light moving in a certain direction and towards oscillasi. Because the electromagnetic waves, including light then light has an electric field, E and also the magnetic field H, both of which are mutual beroscilasi and mutually perpendicular to each other and perpendicular to the direction put in (see picture).

Hasil (Inggris) 2:

Light is energy in the form of electromagnetic waves visible with a wavelength of about 380-750 nm. In the field of physics, light is electromagnetic radiation with a wavelength of either visible or not. Light is a package of particles called photons.
Both the above definition is the nature of light shown simultaneously so-called "wave-particle duality". Packets of light called a spectrum then visually perceived by the senses of sight as color.
The following are some theories about the meaning of light:
1. Korpuskuler theory (Newton)
is a light-corpuscles corpuscles emitted by the source and propagate straight with great speed. This theory can not account for the interference. 2. Electromagnetic Wave Theory (Maxwell) Light is an electromagnetic wave comes from the electric field and magnetic field, moving with a speed of 3 × 108 m / s. 3. Undulation theory (Christian Huygens) Light is a wave coming from the vibrating source, propagating in the medium "ether". This theory can explain the events diffraction, interference and polarization of light propagation dapatmenerangkan but not straight. The properties of the light itself, among others: 1. Can propagate in a vacuum (do not need a medium to propagate). 2. Not electrically charged. 3. A transverse wave (vibration direction perpendicular to the direction of propagation). 4. Propagation direction can not be deflected in the electric field and magnetic field. 5. Have common properties such as experiencing polarization, reflection (reflection), refraction (refraction), intervention, and deflection (diffraction). The polarization or polarization is incident shakes the absorption direction of the wave field. Polarization of light or optical polarization is one of the properties of light that moves oscillasi and towards a certain direction. Because light including electromagnetic waves, then this light has an electric field, E and magnetic field, H are both mutually beroscilasi and perpendicular to each other, and perpendicular to the direction of propagation (see figure).