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LIGHT, When travelling obliquely from one medium to another, the direction…
LIGHT
REFRACTION
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LAWS OF REFRACTION
(i) The incident ray, the refracted ray and the normal to the interface of two transparent media at the point of incidence, all lie in the same plane.
(ii) The ratio of sine of angle of incidence to the sine of angle of refraction is a constant, for the light of a given colour and for the given pair of media.
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REFLECTION
BY MIRROR
SPHERICAL MIRROR
CONCAVE
IMAGE
IMAGE- NATURE, POSITION AND SIZE DEPEND ON THE POSITION OF OBJECT IN FRONT OF THE MIRROR
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CONVEX
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USE
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FOR SECURITY PURPOSE IN SHOPS, STORES AND BUILDINGS
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LAWS OF REFLECTION
(ii) The incident ray, the normal to the mirror at the point of incidence and the reflected ray, all lie in the same plane.
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Speed in vacuum = 300,000 km/sec
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When travelling obliquely from one medium to another, the direction of propagation of light in the second medium changes. This phenomenon is known as refraction of light.
When a ray of light approaches a smooth polished surface and the light ray bounces back, it is called the reflection of light.
the splitting of white light when it passes through a glass prism into its constituent spectrum of colors (i.e. VIBGYOR).
Scattering is the phenomenon in which light ray is redirected in all other directions on passing through particles of dimensions comparable to the wavelength of the light.
Diffraction is the spreading out of waves as they pass through an aperture or around objects. It occurs significantly when the size of the aperture or obstacle is of similar linear dimensions to the wavelength of the incident wave
The degree of convergence or divergence of light rays achieved by a lens is expressed in terms of its power. The power of a lens is defined as the reciprocal of its focal length.