Q. Old-written material, which cannot be read easily, can be read by

  • (A) cosmic rays
  • (B) ultraviolet rays
  • (C) infrared rays
  • (D) X rays
✅ Correct Answer: (C) infrared rays

Published by Chandrakant ⭐ 6.73K Points at 28-Feb-2021 09:25 am in Science

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