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Explain why: (a) A flying bird appears h...

Explain why: (a) A flying bird appears higher in the sky than it really is. (b) Stars appear to twinkle but the sun does not. [Sun is close to the earth so one or the other ray from it always reaches the eye, so it does not appear to twinkle but shines continuously.]

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AAKASH SERIES-RAY OPTICS-EXERCISE (VERY SHORT ANSWER QUESTIONS )
  1. Can absolute refractive index of a medium be less than unity ?

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  2. A beam of light is converging towards a point. A plane parallel plate ...

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  3. Explain why: (a) A flying bird appears higher in the sky than it reall...

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  4. What happens to the frequency, wavelength and speed of light that cros...

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  5. Suppose you are inside the water in a swimming pool near an edge. A fr...

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  6. Light enters from air to glass having refractive index 1.50. What is t...

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  7. Define bond energy. On what factors does it depend?

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  8. State the consequences of total internal reflection?

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  9. What is an optical fibre? State its principle.

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  10. Why do diamonds sparkle?

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  11. A ray of light while traveling from a denser to rarer medium grazes th...

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  12. If theta c in the critical angle, write the deviation value when the r...

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  13. Consider a ray of light passing from one medium to another. If the ang...

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  14. Mention any three uses of optical fibres.

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  15. It is possible for a lens to act as convergent in one medium and diver...

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  16. Can a single lens ever form a real and erect image?

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  17. If the two radii of a thin lens are not equal, will the focal length c...

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  18. What is the focal length if plane surface is silvered in previous illu...

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  19. What will be the equivalent focal length of a system consisting of a t...

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  20. An air bubble is formed inside water. Does it act as a converging lens...

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