This is the class for the 10 class topic is light reflection and refraction type of mirror and image formed by types of mirror and lens Ray diagram laws of reflection  refractive index use of concave mirror and lens and convex mirror and lens  refractive index  dense medium rarer medium human eye .eye defect type of eye defects it's cure and lens used to correct this defect myopic eye myopia , hypermetropic eye hypermetropia accomodation least distance of distinct vision persistence of the vision scattering of light  rainbow formation dispersion of the light power of lens numerical based on mirror formula and numerical based on lens formula cataract it's cause human eye its components and its function .Ray diagram of the myopic eye and its correction of myopic eye corrected with lens Ray diagram of the hypermetropic eye and its correction using lens application of of law of refraction and refractive index numericals on refractive index