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1. The refractive index of four substances A, B, C and D are 1.31, 1.43, 1.33, 2.4 respectively. The speed of light is maximum in
2. Where should an object be placed so that a real and inverted image of same size is obtained by a convex lens
3. A small bulb is placed at the principal focus of a convex lens. When the bulb is switched on, the lens will produce
4. Magnification of a convex lens is
5. A convex lens forms a real, diminished point sized image at focus. Then the position of the object is at
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