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Coloured spectrum is seen when we look t...

Coloured spectrum is seen when we look through a muslin cloth. Why ?

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This shows the diffraction of light through a number of parallel slits. When white light (having a large number of wavelengths) passes through fine slits made by fine threads in muslin cloth, the diffraction of light is very much visible.
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Assertion: Coloured spectrum is seen when we look through a muslim cloth. Reason: It is due to the diffraction of white light on passing through fine slits.

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MBD -HARYANA BOARD-OPTICS-OBJECTIVE TYPE QUESTIONS
  1. Coloured spectrum is seen when we look through a muslin cloth. Why ?

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  2. The focal length of a thin lens in vacuum is f. If the material of the...

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  3. Blue colour of sky is due to phenomenon of :

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  4. The power of a lens of focal length 0.5 m is :

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  5. Two lens of power - 12D and + 7D are in contact with each other, the f...

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  6. Optical fibre are based on

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  7. What is f in mirror formula (1)/(u)+(1)/(v)=(1)/(f) ?

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  8. For a normal eye, the least distance of distinct vision is

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  9. On which principle optical fibre is based ?

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  10. The ratio of intensities of two waves are given by 4:1. The ratio of t...

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  11. For the sustained interference of light, the necessary condition is th...

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  12. If two waves of intensity I and 4 I are super impose, then the minimum...

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  13. RAINBOW

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  14. Which of the following represents correct mirror formula ?

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  15. What is the unit of focal length ?

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  16. The focal length of a lens of power + 4D is :

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  17. Derive lens maker's formula for a thin convex lens.

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  18. The velocity of light in vacuum can be changed by changing

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  19. The focal length of a lens of power – 2D is :

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  20. Polarisation can be produced by

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  21. The refractive index of water is 1.33. What will be the speed of light...

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