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A lens is a portion of a transparent medium bounded by two surfaces and one of these surfaces is essentially spherical. It is used to converge or diverge the light incident on it. Power of a lens is the measure of its ability to converge or diverge the light incident on it. Power of a lens depends on the refractive index of the material of lens with respect to the surrounding medium and the radii of curvature of its two surfaces.
The graph below shows the variation of image distance (v) with the object distance (u) when an object is kept in front of a lens.
A resistance R is connected across a cell with a switch and a rheostat in series. A voltmeter is connected parallel across the cell. Current in the circuit is increased using the rheostat.
Define natural vibrations.
How is this vibration different from damped vibrations in terms of their amplitudes?
A metal piece of thermal capacity 40 JK⁻¹, absorbs 800 J of heat. Calculate the rise in the temperature of this metal piece.
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