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In the adjacent diagram, CP represents a...

In the adjacent diagram, CP represents a wavefront and AO & BP, the corresponding two rays. Find the condition on theta for constructive interference at P between the ray BP and reflected ray OP.
.

A

`cos theta = 3 lambda//2d`

B

`cos theta = lambda//4 d`

C

`sec theta - cos theta = lambda //d`

D

`sec theta - cos theta = 4 lambda//d`

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MODERN PUBLICATION-UNIT TEST -06-EXERCISE
  1. A beam of electrons is used in an Young's double slit experiment.The s...

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  2. A thin slice is cut out of a glass cylinder along a plane parallel to ...

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  3. In the adjacent diagram, CP represents a wavefront and AO & BP, the co...

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  4. Yellow light is used in a single slit diffraction experiment with slit...

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  5. A parallel monochromatic beam of light is incident normally on a narro...

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  6. A beam of light of wavelength 600 nm from a distant source falls on a ...

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  7. A ray of light from a rarer medium strikes a denser medium. The reflec...

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  8. A light ray travelling in glass medium is incident on glass-air interf...

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  9. A ray of light is reflected at angle 30^@.If the angle of incidence be...

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  10. A ray of light travels from the point A to B with a uniform speed.On i...

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  11. A boy is running towards a plane mirror with a speed of 2 m s^(-1).Wit...

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  12. A square wire of side 3 cm is placed 25 cm away from a concave mirror ...

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  14. A concave mirror of focal length f ( in air ) is immersed in water (mu...

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  15. A convex mirror of focal elongth f produces an image magnified m times...

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  16. A convex mirror forms an imge,which is 1//n times the size of the obje...

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  17. A short linear object of length b lies along the axis of a concave mir...

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  19. A virtual image larger than the object can be produced by

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