Optics
Wave optics First what is wave optics ? Ray optics means reflection or refraction of light and what is a light that mean we have to study what is a light ? Newton proposed a theory :- Corpuscular nature of light Corpuscular means a particle of light 1) Hard , elastic and massless . 2) They travel with high speed in the vacuum and else . 3) Different colours due to different shape and size . He explained that speed of light in denser medium is higher than in rarer medium . Vd > Vr ( explained by Newton ) It was WRONG . It was drawback of Newton's corpuscular nature of light . He couldn't explain polarization interference and diffraction . He explained refraction and reflection of light . Theory by Huygens (Wave Nature) He explained that wave is a mechanical wave . Different colours due to different wavelength . Could explain reflection , refraction , interference , and diffractio...