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Wave Optics
Assertion: A secondary rainbow have inverted colours than the primary rainbow.
Reason: The secondary rainbow is formed by single total internal reflection.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.
C.
If assertion is true but reason is false.
In the formation of secondary rainbow, light suffers two total internal reflections instead of one. In this, ray undergoes two internal partial reflections having a maximum deviation of about 50° for red and 54° for violet. Also secondary rainbow will sometimes be formed with inverted colours. Secondary rainbow is fainter than the primary for two reason
(i) the light has undergone two internal reflections and has thereby becomes weakened,
(ii) there is greater angular dispersion in this rainbow than in the primary.
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The refractive index of glass is 1.520 for red light and 1.525 for blue light. Let D1 and D2 be an of minimum deviation for red and blue light respectively in a prism of this glass. Then
A Young’s double slit experiment uses a monochromatic source. The shape of the interference fringes formed on a screen is
When an unpolarized light of intensity I0 is incident on a polarizing sheet, the intensity of the light which does not get transmitted is
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