विज्ञान
MediumQ. No. what-is-the-speed-of-light-in-water
पानी में प्रकाश की चाल कितनी है?
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A3 × 10⁸ m/s
B2.04 × 10⁸ m/s
C2.25 × 10⁸ m/s
D2 × 10⁸ m/s
Correct Answer: 2.25 × 10⁸ m/sYour Answer: C
Explanation
प्रकाश की गति विभिन्न माध्यमों में बार-बार पूछी जाती है। विकल्प A गलत है। 3 × 10⁸ m/s निर्वात में प्रकाश की गति है। विकल्प B गलत है। 2.04 × 10⁸ m/s तारपीन के तेल में प्रकाश की गति है। विकल्प C सही है। छवि तालिका बताती है: पानी में प्रकाश की चाल 2.25 × 10⁸ m/s है। पानी का अपवर्तनांक लगभग 1.33 है। विकल्प D गलत है। 2 × 10⁸ m/s काँच में प्रकाश की गति है।
Important Notes
- Speed of light in different media (m/s): Vacuum=3×10⁸ Water=2.25×10⁸ Turpentine oil=2.04×10⁸ Glass=2×10⁸ Rock salt=1.96×10⁸. Refractive indices: Water=1.33 Turpentine=1.47 Glass=1.5 Rock salt=1.54 Diamond=2.42. Formula: n=c/v. Higher n → lower speed → more bending of light. Glass minimum speed among common transparent media (exam context). Minimum speed mentioned in image = glass.
यह सामग्री अभी उपलब्ध न...
विज्ञान
Answer
2.25 × 10⁸ m/s
Exam Info
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FAQ
यह सामग्री अभी उपलब्ध नहीं है। FAQs
Common questions and clear answers for this topic.
What is optics in physics?
Optics is the branch of physics that studies the behavior of light, including its reflection, refraction, and interaction with lenses and mirrors.
What is the difference between reflection and refraction?
Reflection is the bouncing back of light when it strikes a surface, while refraction is the bending of light as it passes from one medium to another with a different optical density.
What is a lens?
A lens is a transparent optical device with curved surfaces that refracts light to converge or diverge rays, commonly classified as convex (converging) or concave (diverging).
What is the speed of light?
The speed of light in a vacuum is approximately 3 x 10^8 meters per second, denoted by the symbol c.
What is total internal reflection?
Total internal reflection occurs when light traveling from a denser medium to a rarer medium strikes the boundary at an angle greater than the critical angle, causing it to be completely reflected back into the denser medium.