(a) The radius of curvature of the convex surface of a thin Plano convex lens is...

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(a) The radius of curvature of the convex surface of a thin Plano convex lens is 20 cm. If the refractive index of the lens is 1.5, calculate the focal length of the lens. [5] (b) Define total internal reflection. Discuss its application in optical fibre. (c) Refractive index of water and glass are 4/3 and 3/2 respectively. A light ray travelling in water is incident on water glass interface at 45°. What is the angle of refraction? [2] [4] (d) A light beam is incident upon a parallel glass plate, as shown in fig. Find the angle of (i) refraction at the first glass surface, (ii) incidence at the lower glass-air surface, (iii) refraction as the ray goes from glass to air. Use these angles to trace the path of the ray from air to glass and then from glass to air. [5] 379 n, = 1.00 air G' n- 1.50 glass G" G" air (a) The radius of curvature of the convex surface of a thin Plano convex lens is 20 cm. If the refractive index of the lens is 1.5, calculate the focal length of the lens. [5] (b) Define total internal reflection. Discuss its application in optical fibre. (c) Refractive index of water and glass are 4/3 and 3/2 respectively. A light ray travelling in water is incident on water glass interface at 45°. What is the angle of refraction? [2] [4] (d) A light beam is incident upon a parallel glass plate, as shown in fig. Find the angle of (i) refraction at the first glass surface, (ii) incidence at the lower glass-air surface, (iii) refraction as the ray goes from glass to air. Use these angles to trace the path of the ray from air to glass and then from glass to air. [5] 379 n, = 1.00 air G' n- 1.50 glass G" G" air

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