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10. Wave optics — Physics STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 SciencePhysics10. Wave optics1 Mark
MCQ
Assertion : A white source of light during interference forms only white and black fringes.

Reason : Width of fringe is inversely proportional to the wavelength of the light used.

  • A
    If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
  • B
    If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.
  • C
    If the Assertion is correct but Reason is incorrect.
  • ✓
    If both the Assertion and Reason are incorrect.
✓

Answer

Correct option: D.
If both the Assertion and Reason are incorrect.
d
A white source of light during interference will form coloured fringes.

Fringe width is given by $\beta =\frac {\lambda D}{d}$ i.e., it is

directly proportional to wavelength.

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