Physics Exam Preparation
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Physics Exam Preparation
Sample questions with model answers
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A small telescope has an objective lens of focal length 144 cm and an eye piece of focal length 6 cm. What is the separation between the objective and the eye piece?
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The separation is given by the sum of the focal lengths of the objective and eyepiece.
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Prove that the focal length of a spherical mirror is half of its radius of curvature.
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The focal length (f) of a spherical mirror is given by f = R/2, where R is the radius of curvature.
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Mention any three uses of optical fibers.
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1. Telecommunications, 2. Medical instruments, 3. Lighting.
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Derive lens makers formula for convex lens.
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The lens maker's formula is given by 1/f = (n - 1)(1/R1 - 1/R2), where n is the refractive index, R1 and R2 are the radii of curvature.
The full exam-length answer is in the app.
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