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B
Young
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C
Fresnel
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D
Maxwell
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Solution
The correct option is B Huygen Huygensbelieved that light was made up of waves vibrating up and down perpendicular to the direction of the light travels. This is known as 'Huygens' Principle'. According to this theory, light waves are spherical, and these wave surfaces advance or spread out as they travel at the speed of light. This theory explains why light shining through a pin hole or slit will spread out rather than going in a straight line.