Refraction and Dispersion of Light through a Prism — Flashcards

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A prism is a homogeneous, transparent medium such as glass bounded by two plane surfaces inclined to each other at an angle. The two faces are refracting faces, the angle between them is the refractin…

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The angle of deviation is the angle between the incident ray produced forward and the emergent ray produced backward. For a general prism, δ = i + i′ − A, where i is angle of incidence, i′ is angle of…

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Light bends toward the normal when it enters glass from air and bends away from the normal when it leaves glass into air. The combined effect makes the emergent ray deviate toward the base of the pris…

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For refraction through a prism, r + r′ = A, where r is the angle of refraction at the first face, r′ is the angle of incidence at the second face, and A is the angle of prism.

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Given: i = 60°, i′ = 50°, A = 40°. Formula: δ = i + i′ − A Step 1: δ = 60° + 50° − 40° Step 2: δ = 70° Answer: δ = 70°…

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Minimum deviation is the least value of deviation obtained for one particular angle of incidence. At minimum deviation, i = i′ and r = r′ = A/2. If the base angles of the prism are equal, the ray insi…

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n = sin[(A + δm)/2] / sin(A/2), where n is refractive index, A is the prism angle, and δm is the angle of minimum deviation. It is used to find the refractive index of prism material from A and δm.

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Given: A = 60°, δm = 40°. Formula: n = sin[(A + δm)/2] / sin(A/2) Step 1: n = sin[(60° + 40°)/2] / sin(60°/2) Step 2: n = sin 50° / sin 30° Step 3: n = 0.7660 / 0.5 Step 4: n = 1.532 Answer: n = 1.532…