Dispersion of White Light by a PrismPractice Questions & MCQs
Practice Dispersion of White Light by a Prism questions from The Human Eye and the Colourful World (Class 10 Science) - important MCQs with answers and step-by-step solutions. Solve the sample questions below, then practice the full set free on the RankByte app.
Dispersion of White Light by a PrismQuiz - Solve & Score
Q1. Consider the following statements about dispersion: (I) Violet is deviated the most by a prism. (II) White light is a mixture of seven colours. (III) Red has the shortest wavelength. Which of the above statement(s) is/are correct?
- A.Only I
- B.Only I and II
- C.Only III
- D.None of these
Answer: B. Only I and II
Which principle settles this? Correct: I, II. Does that line up with one of the options? Yes - Correct. And the rest? option A) 'Only I' fails since Re-check each statement individually; option C) 'Only III' doesn't hold - Re-check each statement individually. Pick: B) Only I and II.
Q2. Light from a projector lamp crosses a prism, deviating red 38 degrees and violet 42 degrees; by how many degrees is the violet ray spread away from the red ray?
- A.4 degrees
- B.38 degrees
- C.40 degrees
- D.80 degrees
Answer: A. 4 degrees
Angular dispersion = deviation of violet - deviation of red = 42 - 38 = 4 degrees. Violet is always bent more than red, so the difference gives the spread of the spectrum.
Q3. A lighthouse-glass prism separates a beam, turning red 36 degrees and violet 40 degrees; what is the angular dispersion of this prism for the red-violet pair?
- A.4 degrees
- B.36 degrees
- C.76 degrees
- D.38 degrees
Answer: A. 4 degrees
Angular dispersion = deviation of violet - deviation of red = 40 - 36 = 4 degrees. Violet is always bent more than red, so the difference gives the spread of the spectrum.
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