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

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

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

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

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

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

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

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  8. A : One of the images in double refraction doesn't obey the principles...

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  9. Assertion (A): Skiers uses air glasses. Reason(R) : Light reflecte...

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  10. A : 3-D movies are produced by pojecting two images onto a screen, wit...

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  11. Assertion:- Newton's rings are formed in the reflected system. When th...

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  12. A : In a movie ordinary 24 frames are projected per second from one en...

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  13. A : A famous painting was painted by not using brush strokes in the us...

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  14. Assetion To observe diffraction of light the size of obstacle/aperture...

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  15. Assertion (A) : The film which appears bright in reflected system will...

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  16. Statement-1 : On viewing the clear blue portion of the sky through a C...

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  17. A : Diffraction determines the limitations of the concept of light ray...

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

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

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

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