TS EAMCET · Physics · Dual Nature of Matter
A parallel beam of monochromatic light of frequency \(v\) is incident on a surface. The intensity of the beam is \(I\) and area of the surface is \(A\). Find the force exerted by the light of beam on the surface is perfectly reflecting and the light beam is incident at an angle of incidence \(\theta\). (The speed of light is denoted as \(c\).)
- A \(\frac{2 / A \sin ^2 \theta}{\pi C}\)
- B \(\frac{\mid A \cos ^2 \theta}{C}\)
- C \(\frac{21 A \cos ^2 \theta}{c}\)
- D \(\frac{\mid A \cos ^2 \theta}{\sqrt{2} C}\)
Answer & Solution
Correct Answer
(C) \(\frac{21 A \cos ^2 \theta}{c}\)
Step-by-step Solution
Detailed explanation
When a light beam is incident at an angle of incidence \(\theta\), the intensity across the surface is geometrically reduced by the cosine of that angle and the component of the radiation force against the surface will also be reduced by the \(\operatorname{cosine}\) of…
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