The inverse square law of intensity -i-e- the intensity -8734-1r2- is valid for a-a- point source-b- line source-c- plane source-d- cylindrical source

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Standard XII

Physics

Fermat's Principle of Least Time

The inverse s...

Question

The inverse square law of intensity (i.e. the intensity $\infty \frac{1}{r^{2}}$ ) is valid for a
(a) point source
(b) line source
(c) plane source
(d) cylindrical source

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Solution

(a) point source

Intensity of a point source obeys the inverse square law.
Intensity of light at distance r from the point source is given by
$I = S / (4 {πr}^{2})$ ,
where S is the source strength.

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The inverse square law of intensity (i.e. the intensity ∞1r2) is valid for a (a) point source (b) line source (c) plane source (d) cylindrical source

(a) point sourceIntensity of a point source obeys the inverse square law.Intensity of light at distance r from the point source is given byI=S/4πr2 ,where S is the source strength.

The inverse square law of intensity (i.e. the intensity $\infty \frac{1}{r^{2}}$ ) is valid for a
(a) point source
(b) line source
(c) plane source
(d) cylindrical source

(a) point source

Intensity of a point source obeys the inverse square law.
Intensity of light at distance r from the point source is given by
$I = S / (4 {πr}^{2})$ ,
where S is the source strength.