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A : At the first glance, the top surf Mo...

A : At the first glance, the top surf Morpho butterfly.s wing appears a beautifu blue green. If the wing moves the colour changes.
R : Different pigments in the wing reflect light at different angles.

A

Both A and R are true and R is the correct explanation of A

B

Both A and R are true and R is not the correct explanation of A

C

A is true and R is false

D

Both A and R are false

Text Solution

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The correct Answer is:
C
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A : In Young.s interference experiment the incident light used is white. When one slit is convered with red filter and the other with blue filter, the phase difference at any point on the screen will continuously change and producing uniform illumination. R : Two independent sources of light would no longer act as coherent sources.

When a ray of sun light passes through the prism, each colour of light has its own speed in the glass. The seven colours come out of the prism with different angles of deviation. Red deviates least and blue deviates maximum. Thus a prism can disperse a white light into seven colours which is called colour spectrum. For a thin prism, the angle of deviation is given as delta=(n-1)A . The angle of dispersion is given as phi=delta_(v)-delta_(r) . The dispersive power of a prism is omega=(phi)/(delta_("mean"))=(phi)/(delta_(y)) Using the above ideas, give answer the following questions. A prism has R.I. for violet and red n_(v)=1.523, n_(r)=1.5145 . If the angle of prism is A=2^(@) the dispersive power of the prism is :

AAKASH SERIES-WAVES OPTICS-EXERCISE -IB (ASSERTION AND REASON)
  1. A : Diffraction is common is sound but not common in light waves R :...

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  2. A : There is no specific important physical difference between interfe...

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  3. A : At the first glance, the top surf Morpho butterfly.s wing appears ...

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  4. A : Coloured spectrum is seen when we look through a muslin cloth. R...

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  5. Assertion : The clouds in sky generally appear to be whitish. Reason...

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  6. A : In double slit experiment, the pattern on the screen is actually a...

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  7. Assertion : Standard optical diffraction gratings cannot be used for ...

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  8. A : When tiny circular obstacle is placed in the path of light from so...

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  9. A : The resolving power of both miroscope and telescope depends on the...

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  10. A : The resolving power of an electron microscope is higher than that ...

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  11. Assertion (A) To increase resolving power of a telescope, the apertur...

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  12. A : To increase the resolving power of a microscope, .oil immersion ob...

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  13. Assertion : The resolving power of a telescope is more if the diameter...

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  14. A : Resolving power of a microscope can be increased by choosing a med...

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  15. A : Spy satilight cameras use lenses with very large aperatures. R :...

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  16. A : Transverse wave nature of light is proved by polarisation. R : A...

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  17. A : Nicol prism is used to produce and analyse plane polarised light. ...

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  18. A : When an unpolarised light is incident on a glass plate at Brewster...

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  19. A : The unpolarised light and polarised light can be distinguished fro...

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  20. A : Light coming from numbers of calculator.s L.C.D display is polaris...

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