Optics Exam Preparation
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Optics Exam Preparation
This section covers the principles of refraction, critical angles, minimum deviation, and the behavior of optical systems involving prisms and lenses. Understanding the relationships between angles, refractive indices, a...
Sample questions with model answers
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For no TIR to take place, a prism can have a maximum refracting angle of (θc = critical angle for the material of prism)
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θc
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A ray of light is incident at small angle I on the surface of prism of small angle A and emerges normally from the opposite surface. If the refractive index of the material of the prism is μ, the angle of incidence is nearly equal to
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A/μ
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The refractive angle of a prism is A, and the refractive index of the material of the prism is cot(A/2). The angle of minimum deviation is
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180° - 2A
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The focal length of a combination of two lenses is doubled if the separation between them is doubled. If the separation is increased to 4 times, the magnitude of focal length is (as compared to original)
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quadrupled
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