Explain how the focal points and focal lengths of the following optical elements

Question

Explain how the focal points and focal lengths of the following optical elements are determined. (i) converging lens (ii) diverging lens (iii) concave mirror (iv) convex mirror A beam of light that is parallel to the principal (optic) axis is incident on a concave mirror. What happens to the reflected beam of light? Choose the right answer(s) (A) It is also parallel to the principal axis. (B) It is perpendicular to the principal axis. (C) It passes through the center of curvature of the mirror. (D) It passes through the focal point of the mirror.

Explanation / Answer

2.1 When beam of light parallel to Principle axis incident on Convex lens,concave lens , concave mirror and convex mirror then is passes through focal point and the measurement of distance between focal point and the center of lens is focal length

2.2. Option D is correct

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