Q. Telephone conversations and internet data are now transmitted across continents using

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Q. As compare to copper wires, the loss of signal in optical fiber is

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Q. The angle of incidence in the optically denser medium for which the angle of refraction is less dense medium is 90° is known as

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Q. In periscopes, prisms are positioned to reflect light through

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Q. When light passes from an optically denser to a less denser medium, there occur

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Q. Binoculars make use of prisms to

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Q. Thermal energy always flow from a region of

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Q. The thermal energy is transferred only when there is

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Q. Thermal energy is transferred by

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Q. The boiling point of water is

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Q. Water freezes to form ice at

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Q. We are able to see everything around us because of

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Q. A bundle of light rays form a

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Q. The objects that do not give off light are known as

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Q. Light travels in

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Q. The objects that give off light are known as

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Q. It is possible for light to circle the Earth more than seven times in

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Q. Which of the following is true?

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Q. The types of light beam are

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Q. In vacuum, light travels in an amazing speed of

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