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a light beam travelling in air with a wavelength of 650 NM falls on a glass block. what is the speed of the light beam in glass (c= 3.0x108 m/s, nglass = 1.5) ? a. 3.10x10^8 m/s b. 2.0x10^8 m/s c. 1.5x10^8 m/s d. 1.0x10^8 m/s​

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