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JEE Mains · Physics · STD 12 - 9. Ray optics and optical instruments

यदि एक प्रिज्म के पदार्थ का अपवर्तनांक \(\cot \left(\frac{\mathrm{A}}{2}\right)\) है जहाँ \(\mathrm{A}\) प्रिज्म कोण है तब न्यूनतम विचलन कोण होगा:

  1. A \(\pi-2 \mathrm{~A}\)
  2. B \(\frac{\pi}{2}-2 \mathrm{~A}\)
  3. C \(\pi-\mathrm{A}\)
  4. D \(\frac{\pi}{2}-\mathrm{A}\)
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Answer & Solution

Correct Answer

(A) \(\pi-2 \mathrm{~A}\)

Step-by-step Solution

Detailed explanation

\( \cot \frac{A}{2}=\frac{\sin \left(\frac{A+\delta_{\min }}{2}\right)}{\sin \frac{A}{2}} \) \( \Rightarrow \cos \frac{A}{2}=\sin \left(\frac{A+\delta_{\min }}{2}\right) \) \( \frac{A+\delta_{\min }}{2}=\frac{\pi}{2}-\frac{A}{2} \) \( \delta_{\min }=\pi-2 A\)
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