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In lecture 12, Seema Ma'am will explain the Optical Instruments from the chapter Human Eye & The Colourful World in detail for all class 10 students in Unacademy Foundation.
Scattering occurs when light or other energy waves pass through an imperfect medium (such as air filled with particles of some sort) and are deflected from a straight path. A great example is when the sun's rays pass through clouds. The light is deflected off of its straight path and scatters in many directions.
A prism is a transparent optical element with flat, polished surfaces that refract light. At least two of the flat surfaces must have an angle between them. The exact angles between the surfaces depend on the application. The traditional geometrical shape is that of a triangular prism with a triangular base and rectangular sides, and in colloquial use "prism" usually refers to this type. Some types of the optical prism are not in fact in the shape of geometric prisms. Prisms can be made from any material that is transparent to the wavelengths for which they are designed.
A dispersive prism can be used to break light up into its constituent spectral colors (the colors of the rainbow). Furthermore, prisms can be used to reflect light or to split light into components with different polarizations.
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