Total Internal Reflection
Total Internal Reflection is a Science & Technology concept from the MPSC syllabus, tested in 3 past MPSC questions (2016, 2019, 2021). Below are those real questions with their correct answers and explanations, plus the concepts worth being comfortable with first.
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प्रकाशाकीय तंतू हा खालीलपैकी कोणत्या तत्त्वावर आधारित आहे ? Optical fibre is based on which of the following principles ?
(a)प्रकाशाच्या परावर्तानाचे तत्वावर / Principle of reflection of light
(b)प्रकाशाच्या अपवर्तनाचे तत्वावर / Principle of refraction of light
(c)प्रकाशाच्या पूर्ण आंतरिक परावर्तानाचे तत्वावर / Principle of total internal reflection
(d)प्रकाशाच्या अपस्करण तत्वावर / Principle of dispersion of light
Optical fibres work on the fundamental principle of Total Internal Reflection (TIR), where light rays traveling through the core undergo repeated total internal reflections.
डबक्यातील गुळगुळीत वाटोळ्‍या दगडाचे आपण जर निरीक्षण केल्यास तो आपल्याला / If we observe a pebble in a pool, the pebble would appear to be
Due to refraction of light, an object submerged in water appears raised, meaning it appears nearer to the surface than it actually is.
जर प्रकाश पहिल्या माध्यमातून 2 × 10⁸ ms⁻¹ वेगाने जाताना दुसऱ्या माध्यमात त्याचा वेग 1.25 × 10⁸ ms⁻¹ होत असेल तर दुसऱ्या माध्यमाचा पहिल्या माध्यमाच्या संदर्भातील अपवर्तनांक काढा. Find the refractive index of the second medium with respect to the first medium, if light moves through the first medium with velocity 2 × 10⁸ ms⁻¹, which changes to 1.25 × 10⁸ ms⁻¹ in the second medium.
Refractive index of second medium with respect to first medium is given by the ratio of speed of light in the first medium to that in the second medium: (2 × 10⁸) / (1.25 × 10⁸) = 1.6.