1. A ray of light incident at an angle on a refracting face of a prism emerges f

Question

1. A ray of light incident at an angle on a refracting face of a prism emerges from the other face normally. If the angle of the prism is 5 and the prism is made of a material of refractive index 1.5, the angle of incidence is: (a) 7.5 (c) 15 (b) 5 (d) 2.5 2. An object approaches a convergent lens from the left of the lens with a uniform speed 5 m/s and stops at the focus The image: (a) Moves away from the lens with an uniform speed 5 ms-1. (b) Moves away from the lens with an uniform acceleration. (c) Moves away from the lens with a non-uniform accelera- tion. (d) Moves towards the lens with a non-uniform acceleration. 3. The radius of curvature of the curved surface of a plano-convex lens is 20 cm. If the refractive index of the material of the lens be 1.5, it will (a) Act as a convex lens only for the objects that lie on its (b) Act as a concave lens for the objects that lie on its curved (c) Act as a convex lens irrespective of the side on which the curved side. side. object lies. (d) Act as a concave lens irrespective of side on which the object lies. 4. The phenomena involved in the refection of radio waves by ionosphere is similar to: (a) Refection of light by a plane mirror. (b) Total internal refection of light in air during a mirage (c) Dispersion of light by water molecules during the forma- tion of a rainbow (d) Scattering of light by the particles of air

Explanation / Answer

4). Phenomenon involving in the refraction of radio wave by ionosphere is similar to the total internal reflection of light during mirage. Because of this light bends continuously and reaches the reciever.

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