हीरे में प्रकाश का वेग क्या है यदि निर्वात के संबंध में हीरे का अपवर्तनांक 2.5 है?

  1. 1.2 × 108 m/s
  2. 5 × 108 m/s
  3. 1.2 × 1010 m/s
  4. 2.5 × 108 m/s

Answer (Detailed Solution Below)

Option 1 : 1.2 × 108 m/s
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Detailed Solution

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सही जवाब 1.2 × 108 m/s है।

Key Points

अवधारणा :

  • अपवर्तनांक: निर्वात में प्रकाश का वेग और माध्यम में प्रकाश के वेग के अनुपात को उस माध्यम के अपवर्तनांक के रूप में जाना जाता है।

\(\text{The refractive index of a substance/medium}=\frac{\text{Velocity of light in vacuum}}{\text{Velocity of light in the medium}}\)

तो μ = c/v

जहाँ c निर्वात में प्रकाश की चाल है और v माध्यम में प्रकाश की चाल है।

गणना :

दिया हुआ है कि:

हीरे का अपवर्तनांक (µd) = 2.5

हम जानते हैं

निर्वात में प्रकाश का वेग (c) = 3 × 108 m/s

हीरे में प्रकाश का वेग (v) ज्ञात करना है

अब,

\(μ _d=\frac{c}{v}\\ or, \; 2.5= \frac{3 \times 10^8}{v}\\ or, \; v=\frac{3 \times 10^8}{2.5}=1.2\times 10^8 \; m/s\)

इसलिए विकल्प 1 सही है।

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