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അധിവർഷം ഉണ്ടാകുന്നത് എത്ര വർഷത്തിലൊരിക്കലാണ് ?

A4

B8

C2

D6

Answer:

A. 4


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A beam of white light undergoes dispersion through a triangular glass prism forming a band of seven colours. Which of the statements is/are correct?

  1. a) The red-coloured component has minimum refractive index.
  2. (b) The violet-coloured component deviates the least.
  3. (c) All components of white light have same speed in glass.
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