alleryStart learning →The refractive index of a medium is 1.5. The speed of light in this medium is:
- 4.5 × 10⁸ m/s
- 3.0 × 10⁸ m/s
- 2.0 × 10⁸ m/s
- 1.5 × 10⁸ m/s
Show answer and solution
Correct answer: C. 2.0 × 10⁸ m/s
n = c/v, so v = c/n = (3 × 10⁸)/1.5 = 2.0 × 10⁸ m/s.
Indian Navy AA (Artificer Apprentice) Light - Reflection and Refraction — practice questions
Explore 2 free Light - Reflection and Refraction questions in Indian Navy AA (Artificer Apprentice) Science. Open each question or exercise to read its content, reference answers and available explanation.
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Worked practice questions
A diverging lens is also called:
- Convex lens
- Concave lens
- Plano-convex lens
- Biconvex lens
Show answer and solution
Correct answer: B. Concave lens
1. A diverging lens spreads parallel rays away from a central axis.
2. Such a lens is thinner at the centre and thicker at the edges — i.e. concave.
3. Convex lenses converge rays.
_Source: syllabus Science, Ch 9 "Light Reflection and Refraction", §9.4_
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