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Two beams of red and violet colours are made to pass separately through a prism (angle of the prism is 60°). In the position of minimum deviation, the angle of refraction will be
  • a)
    30° for both the colours
  • b)
    greater for the violet colour
  • c)
    greater for the red colour
  • d)
    equal but not 30° for both the colours
Correct answer is option 'A'. Can you explain this answer?
Verified Answer
Two beams of red and violet colours are made to pass separately throug...
For minimum deviation the ray in the prism is parallel to the base of the prism. This condition does not depend on the colour (or wave length) of incident radiation. So in both the cases, by geometry, r = 30º. So (a) is correct option.
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Most Upvoted Answer
Two beams of red and violet colours are made to pass separately throug...
Degrees). Which beam will be deviated more?
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Two beams of red and violet colours are made to pass separately through a prism (angle of the prism is 60°). In the position of minimum deviation, the angle of refraction will bea)30° for both the coloursb)greater for the violet colourc)greater for the red colourd)equal but not 30° for both the coloursCorrect answer is option 'A'. Can you explain this answer?
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