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........ light, while passing through a ...

........ light, while passing through a prism, does not disperse.

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Monochromatic (It means light of single frequency, i.e., of single colour.)
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In the above figure a narrow beam of white light is shown to pass through a triangular glass prism. After passing through the prism, it produces a spectrum XY on a screen. State the colour seen at (i) X and (ii) Y.

For a light ray passing through the prism, the angle between the incident ray and the emergent ray is known as the .........

When a beam of white light is passed through a triangular glass prism, it gets dispersed into its component colours. Why do we get these colours ? In the given figure, the colours X and Y represent the extreme components of the spectrum. Identify X and Y.

For refractin of light through a prism

When white light passes through prism, which colour of light will experience minimum deviation ?

White light is passed through a prism of angle 5^@ . If the refractive indices for red and blue colours are 1.641 and 1.659 respectively, calculate the angle of deviation between them, also calculate the dispersive power.

A horizontal ray of light passes through a prism of index 1.50 and apex angle 4^(@) and then strikes a vertical mirror , as shown in the figure. Through what angle must the mirror be rotated if after reflection the ray is to be horizontal?

A glass prism of angle A = 60^(@) gives minimum angle of deviation theta ~~ 30^(@) with the maximum error of 1^(@) when a beam of parallel light passed through the prism during an experiment. Find the permissible error in the measurement of refractive index mu of the material of the prism.

A ray of light passing through the point (1,2) reflects on the X -axis at point A and the reflected ray passes through the point (5,3) . Find the coordinates of A.

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KUMAR PRAKASHAN-THE HUMAN EYE AND THE COLOURFUL WORLD-OBJECTIVE QUESTIONS AND ANSWERS(Fill in the blanks)
  1. The type of image formed by the eye lens is ......... and .......

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  2. A triangular glass prism has ......... triangular bases and ......... ...

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  3. Light enters our eye through the .......

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  4. A person suffering from far-sightedness or hypermetropia cannot see cl...

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  5. A ......... corrective lens is used to rectify near-sightedness.

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  6. An old person suffering from near-sightedness and a far-sightedness us...

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  7. While passing through the prism the light ray travelling from air to g...

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  8. In a glass prism ......... light propagates with maximum speed.

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  9. At night stars are seen slightly at a higher position than their actua...

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  10. For a light ray passing through the prism, the angle between the incid...

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  11. At the time of sunrise the sun appears ........ in colour.

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  12. The fine particles in air scatter ......... light more strongly.

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  13. ........ light, while passing through a prism, does not disperse.

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  14. Stars behave like ........ sources of light and planets behave like .....

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  15. Danger signals are red in colour because red light is ..........

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  16. In the spectrum of white light, ……….. and ........ colours seen at the...

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  17. The diameter of the human eyeball is approximately ..... . cm.

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  18. The distance between the eye lens and the retina is known as the ........

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  19. In the normal situation in the relaxed position of the ciliary muscles...

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  20. At night as we move up in the atmosphere of the earth, the refractive ...

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