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According to Huygens’ principle, every point on a wavefront acts as a source of secondary wavelets. When light enters a new medium, its speed changes. Due to this change in speed, the wavelets bend, causing the light ray to change direction. This bending of light is called refraction.
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Question : In a filament-type light bulb, most of the electric power consumed appears as
Option 1: visible light
Option 2: infrared rays
Option 3: ultraviolet rays
Option 4: fluorescent light
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