If the distance from an isotropic point source is doubled, the illuminance becomes
Options
- A. One-half of the original
- B. One-fourth of the original
- C. Twice the original
- D. Four times the original
- E. Unchanged
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Correct Answer (Detailed Explanation is Below)
B. One-fourth of the original
Detailed Explanation
Illuminance varies inversely as the square of distance: E ∝ 1/r². Doubling distance makes E one-fourth.
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