Q: If the illuminance of a surface from a point source is to be reduced to 25%, the distance of the surface from the source must be यदि एक बिन्दु स्रोत से किसी सतह पर पड़ने वाली तीव्रता को घटाकर 25% तक लाना है, तो सतह की स्रोत से दूरी की
A.
increased by 25%/25% से बढ़ाना होगा
B.
increased by 50%/50% से बढ़ाना होगा
C.
increased by 75%/75% से बढ़ाना होगा
D.
increased by 100%/100% से बढ़ाना होगा
Correct Answer:
Option D -
Explanations:
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