1) A ray of light passing through the optical centre of a convex lens ___________ after refraction. a) emerges without any deviation b) emerges parallel to the principal axis c) passes through the second principal focus d) passes through the centre of curvature 2) SI unit of power of lens is  a) Dioptre b) Micrometre c) Kilometre d) Metre 3) A ray of light passing through the first principal focus of a convex lens ___________ after refraction. a) emerges without any deviation b) emerges parallel to the principal axis c) passes through the second principal focus d) passes through the centre of curvature 4) The power of lens is a) 1 ⁄ p b) 1 ⁄ q c) 1 ⁄ f d) 1 ⁄ l 5) What is the power of concave lens? a) Positive b) Negative c) Both d) None of the above

Rules of Refraction through Spherical Lens and Power of Lens

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