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What is optical fibre ? On what principl...

What is optical fibre ? On what principle it works ? Give two application of optical fibres.

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MODERN PUBLICATION-RAY OPTICS AND OPTICAL INSTRUMENTS-Revision Exercises (Short Answer Questions)
  1. What is total internal reflection ? What are its conditions ? Establis...

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  2. What is critical angle for a material of refractive index sqrt(2) ?

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  3. What is optical fibre ? On what principle it works ? Give two applicat...

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  4. Explain the term critical angle for a pair of media. Derive a relation...

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  5. State the conditions under which total internal reflection occurs. One...

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  6. A symmetric biconvex lens of radius of curvature R and made of glass o...

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  7. Obtain an expression for focal length of a combination of thin lenses ...

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  8. Two convex lenses of same focal length but of paerture A(1) and A(2)(A...

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  9. Draw the schematic diagram of a Cassegrain telescope.

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  10. Deduce the equivalent focal length of two convex lenses of focal lengt...

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  11. An equiconvex lens of refractive index mu(1), focal length 'f' and ra...

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  12. The image of a candle is formed by a convex lens on a screen. The lowe...

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  13. A figure divided into squares, each of size 1.0 mm^2 is being viewed a...

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  14. Two monochromatic rays of light are incident normally on the face AB o...

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  15. Obtain an expression for the combined focal length for two thin convex...

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  16. लेंस समीकरण (1)/(v) -(1)/(u) =(1)/(f) की सहायता से दर्शाइए कि अवतल ल...

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  17. A ray of light falling at an angle of 50^@ is refracted through a pris...

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  18. How does angle of deviation vary with the angle of incidence in case o...

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  19. Sky appears blue in colour. Explain.

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  20. Why does the sun appear red at sunset ?

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