LED BULB An LED bulb is a semiconductor device that emits visible light when an electric current passes through it. The colour of the emitted light will depend on the type of materials used. With the help of chemical compounds like Gallium Arsenide and Gallium Phosphide, the manufacturer can produce LED bulbs that radiate red, […]
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Audible waves These are sound waves with a frequency ranging between 20 Hz and 20,000 Hz. These are generated by vibrating bodies such as vocal cords, stretched strings etc. Infrasonic waves These are sound waves with a frequency below 20 Hz that cannot be heard by the human ear. E.g., waves produced during earthquakes, ocean
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S.no Convex Lens Concave Lens 1 A convex lens is thicker in the middle than at the edges. A concave lens is thinner in the middle than at the edges. 2 It is a converging lens. It is a diverging lens. 3 It produces mostly real images. It produces virtual images. 4 It is
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