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Optic physics (laws of reflection (types of reflection (Regular Reflection…
Optic physics
laws of reflection
types of reflection
Regular Reflection When a parallel beam of reflected light rays is obtained for a parallel beam of incident light rays after reflection from a plane reflecting reflection
Irregular or Diffused Reflection When a non-parallel beam of reflected light rays is obtained for a parallel beam of incident light rays after reflection from a surface
The incident ray, the reflected ray and the normal at the point of incidence all three lie in the same plane.
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lences and mirrors
Distance of image == Distance of object
A plane mirror may form a virtual as well as real image.
A man may see his full image in a mirror of half height of man.
Some Terms Related to Spherical Mirrors are Given Below
(i) Centre of Curvature It is the centre of the sphere of which the mirror or lens is a part.
(ii) Radius of Curvature (R) The radius of the hollow sphere of which the mirror is a part, is called radius of curvature.
(iii) Pole The central point of the spherical mirror is called its pole (P).
A smooth and highly polished reflecting surface is called a mirror.
(i) Plane Mirror A highly polished plane surface is called a plane mirror.
Different properties of image formed by plane mirror
Size of image = Size of object
Magnification == Unity
(iv) Focus When a parallel beam of light rays is incident on a spherical mirror, then after reflection it meets or appears to meet at a point on principal axis, which is called focus of the spherical mirror.
(v) Focal Length The distance between the pole and focus is called focal length (f). Relation between focal lengthand radius of curvature is given by
f=R/2
refraction of light
Refraction is the bending of a wave when it enters a medium where its speed is different. The refraction of light when it passes from a fast medium to a slow medium bends the light ray toward the normal to the boundary between the two media. The amount of bending depends on the indices of refraction of the two media and is described quantitatively by Snell's Law.
index of refraction The index of refraction is defined as the speed of light in vacuum divided by the speed of light in the medium.
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Shell's law nell's Law relates the indices of refraction n of the two media to the directions of propagation in terms of the angles to the normal. Snell's law can be derived from Fermat's Principle or from the Fresnel Equations.
