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Q: Which of the following instruments use the principle of refraction?
  • A. Radio
  • B. Spectacles
  • C. Mobile
  • D. Clock
Correct Answer: Option B - Spectacles use the principle of refraction. Optical instruments such as microscopes, telescopes and cameras use mirrors and lenses to reflect and refract light and from images.
B. Spectacles use the principle of refraction. Optical instruments such as microscopes, telescopes and cameras use mirrors and lenses to reflect and refract light and from images.

Explanations:

Spectacles use the principle of refraction. Optical instruments such as microscopes, telescopes and cameras use mirrors and lenses to reflect and refract light and from images.