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A substance has critical angle of 45^(@)...

A substance has critical angle of `45^(@)` for yellow light. What is its refractive index ?

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MODERN PUBLICATION-RAY OPTICS AND OPTICAL INSTRUMENTS-Revision Exercises (Very Short Answer Questions)
  1. Why danger signals are red ?

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  2. Write the relation between critical angle and refractive index of a me...

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  3. A substance has critical angle of 45^(@) for yellow light. What is its...

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  4. If (sini)/(sinr)=n(21)gt1. Out of medium 1 and medium 2, which is mor...

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  5. A convex lens is placed in contact with a plane mirror. An axial point...

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  6. A biconcave lens made of a transparent material of refractive index 1...

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  7. The radii of curvature of both the surfaces of a convex lens are equal...

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  8. Two thin lenses of power +6 D and -2 D are in contact. What is the foc...

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  9. For the same value of angle of incidence, the angles of refraction in ...

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  10. When red light passing through a convex lens is replaced by light of b...

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  11. A glass lens of refractive index 1.5 is placed in a trough of liquid. ...

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  12. Your are given following three lense. Which two lenses will you use as...

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  13. Does the critical angle depend on the wavelength of the light ?

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  14. Due to which phenomenon, advanced sunrise and delayed sunset occur ?

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  15. What will be the effect on the power of a glass lens if it is immersed...

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  16. Define one dioptre.

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  17. Find the focal length of a lens having -0.5 D power.

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  18. What is total internal reflection of light ? What are conditions for t...

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  19. What are optical fibres ? What is the principle on which optical fibre...

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  20. What is the main requirement in fabricating optical fibres ?

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