A point light source emits E.M. waves in free space. A detector, placed at a distance of Lm, measures the intensity as $\mathrm{I}_0$. The detector is now shifted to another location on the same spherical surface ensuring the angle between original location and new location as $45^{\circ}$. The measured intensity at new location will be $\_\_\_\_$。
Select the correct option:
A
$\frac{I_{\mathrm{o}}}{4}$
B
$\mathrm{I}_0$
C
$\frac{I_0}{\sqrt{2}}$
D
$\frac{I_{\mathrm{o}}}{2}$
✓ Correct! Well done.
✗ Incorrect. Try again or view the solution.
Solution
Distance is same
So intensity is also same
$$
I=\frac{P}{4 \pi R^2}
$$
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