JEE Physics Prism Deviation and Dispersion Notes, Formula & Questions

Prism (Deviation & Dispersion) is an important topic in Geometrical Optics and frequently appears in JEE Main and JEE Advanced examinations. A prism is a transparent optical element with refracting surfaces inclined at a specific angle, known as the prism angle. When light passes through a prism, it undergoes refraction at both surfaces, causing the light ray to deviate from its original path. The angle through which the light bends is called the angle of deviation.

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This chapter covers the concepts of refraction through a prism, angle of deviation, minimum deviation, prism formula, and the relationship between refractive index and prism angle. Students also learn about the phenomenon of dispersion, where white light splits into its constituent colors due to different wavelengths refracting by different amounts. This explains the formation of the visible spectrum and the working principles of spectrometers and optical instruments.

Understanding prism-related concepts is essential for solving numerical problems involving minimum deviation, refractive index calculations, angular dispersion, and dispersive power. Since optics is a high-scoring section in JEE Physics, mastering deviation and dispersion through prisms helps students develop strong analytical and problem-solving skills for competitive examinations.

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