AP EAMCET · PHYSICS · Wave Optics
Assertion A : For light diverging from a point source, the intensity at the wavefront does not depend on the distance.
Reason \(\mathbf{R}\) : In a diverging beam of light from a point source, spherical wavefront is observed.
- A (A) and (R) are true and (R) is the correct explanation of (A).
- B Both (A) and (R) are true, but (R) is not the correct explanation of (A).
- C (A) is true but (R) is false
- D (A) is false but (R) is true.
Answer & Solution
Correct Answer
(D) (A) is false but (R) is true.
Step-by-step Solution
Detailed explanation
We have \(I=\frac{E}{A t}=\frac{E}{\left(4 \pi r^2\right) t} \propto \frac{1}{r^2}\) So, intensity depends on distance \(\Rightarrow\) (A) is false and, for diverging beam wavefront is spherical as shown So \((\mathrm{R})\) is true.
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