INSIGHT UPSC QUIZ

Science & Technology General Science
Q.

Read the following statements carefully and select the correct answer from codes given below:

1. The phenomenon of splitting of white light into its seven component colours by a prism is called dispersion.

2. While passing through a prism, the violet light bends the least while the red the most.

3. Isaac Newton was the first to use a glass prism to obtain the spectrum of sunlight.

Which of the statements given above is/are correct?

Explanation:

ANSWER: (D) 

  • White light is dispersed into its seven-colour components by a prism. (Thus, Statement 1 is correct)
  • Different colours of light bend through different angles with respect to the incident ray, as they pass through a prism. The red light bends the least while the violet the most. (Thus, Statement 2 is not correct)
  • Thus, the rays of each colour emerge along different paths and thus become distinct. It is the band of distinct colours that we see in a spectrum.
  • Isaac Newton was the first to use a glass prism to obtain the spectrum of sunlight. (Thus, Statement 3 is correct)

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