Light Leaving a Point Source Spreads Out So That the Apparent

question 22

Multiple Choice

Light leaving a point source spreads out so that the apparent brightness I of light per unit area varies with distance d according to which of these laws ( $\infty$ means "proportional to") ?

• A) I = constant
• B) I \(\infty\) 1/d²
• C) I \(\infty\) d²
• D) I \(\infty\) 1/d

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