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Q: Which of the following does not have an optical lens?
  • A. periscope
  • B. telescope
  • C. microscope
  • D. stethoscope
Correct Answer: Option D - A stethoscope does not have an optical lens. A stethoscope can be used to listen to the sounds made by the heart, lungs or intestines as well as blood flow in arteries and viens.
D. A stethoscope does not have an optical lens. A stethoscope can be used to listen to the sounds made by the heart, lungs or intestines as well as blood flow in arteries and viens.

Explanations:

A stethoscope does not have an optical lens. A stethoscope can be used to listen to the sounds made by the heart, lungs or intestines as well as blood flow in arteries and viens.