SATHEE: Optics 2 Question 22

Optics 2 Question 22

22. A light wave of frequency $5 \times 10^{14} H z$ enters a medium of refractive index 1.5. In the medium the velocity of the light wave is and its wavelength is ……

(1983, 2M)

Passage Based Questions

Passage 1

Light guidance in an optical fibre can be understood by considering a structure comprising of thin solid glass cylinder of refractive index $n_{1}$ surrounded by a medium of lower refractive index $n_{2}$ . The light guidance in the structure takes place due to successive total internal reflections at the interface of the media $n_{1}$ and $n_{2}$ as shown in the figure. All rays with the angle of incidence $i$ less than a particular value $i_{m}$ are confined in the medium of refractive index $n_{1}$ . The numerical aperture (NA) of the structure is defined as $\sin i_{m}$ .

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Answer:

Correct Answer: 22. $2 \times 10^{8} m / s, 4 \times 10^{- 7} m$

Solution:

$v = \frac{c}{μ} = \frac{3 \times 10^{8}}{1.5} = 2.0 \times 10^{8} m / s$

$λ = \frac{v}{f} = \frac{2.0 \times 10^{8}}{5.0 \times 10^{14}} = 4.0 \times 10^{- 7} m$

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Optics 2 Question 22

22. A light wave of frequency $5 \times 10^{14} H z$ enters a medium of refractive index 1.5. In the medium the velocity of the light wave is and its wavelength is ……

Passage Based Questions

Passage 1

Answer:

इंजीनियरिंग की तैयारी

चिकित्सा तैयारी

एनसीईआरटी पुस्तकें और समाधान

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अन्य संसाधन

पाठ्यक्रम

परीक्षा मंच

नमूना मॉक टेस्ट

सदस्यता

एनसीईआरटी व्यायाम वीडियो समाधान

Optics 2 Question 22

22. A light wave of frequency 5×1014Hz enters a medium of refractive index 1.5. In the medium the velocity of the light wave is and its wavelength is ……

Passage Based Questions

Passage 1

Answer:

इंजीनियरिंग की तैयारी

चिकित्सा तैयारी

एनसीईआरटी पुस्तकें और समाधान

महत्वपूर्ण संसाधन

अन्य संसाधन

पाठ्यक्रम

परीक्षा मंच

नमूना मॉक टेस्ट

सदस्यता

एनसीईआरटी व्यायाम वीडियो समाधान

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22. A light wave of frequency $5 \times 10^{14} H z$ enters a medium of refractive index 1.5. In the medium the velocity of the light wave is and its wavelength is ……