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प्रश्न
Light from a point source falls on a small area placed perpendicular to the incident light. If the area is rotated about the incident light by an angle of 60°, by what fraction will the illuminance change?
एका वाक्यात उत्तर
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उत्तर
If the area is rotated about the incident light by any angle, the illuminance will not change.
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Light Process and Photometry
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