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1 PHYSICS MCQS

An optical instrument which is used to measure the properties of visible light is called?

  • Microscope
  • Telescope
  • Spectroscope
  • Oscilloscope
Correct Answer: C. Spectroscope

Detailed Explanation

A spectroscope is a fundamental optical instrument in physics and chemistry used for studying light properties. It works on the principle of dispersion, where light is separated into its constituent colors or wavelengths using a prism or diffraction grating.


🔹 Structure and Working




  • A slit allows light to enter the instrument.




  • A prism or diffraction grating disperses the light into its spectral components.




  • A telescope or viewing lens magnifies the spectrum so it can be observed or recorded.




🔹 Applications




  1. Astronomy: Studying the spectra of stars and galaxies to determine their composition and motion.




  2. Chemistry: Identifying elements in a sample by analyzing their emission or absorption spectra.




  3. Physics Education: Demonstrating light dispersion and wavelength measurements.




  4. Industrial Applications: Checking the purity of light sources or analyzing emission lines.




🔹 Why Not Other Options?




  • Microscope: Magnifies very small objects, does not measure light properties.




  • Telescope: Used to observe distant objects, primarily in astronomy.




  • Oscilloscope: Displays electrical signals as waveforms, unrelated to light.




🔹 Key Features of Spectroscope




  • Separates light into its spectrum




  • Measures wavelengths, intensity, and composition




  • Can be manual or digital, depending on precision needs






✅ Key Facts Recap




  • Spectroscope = optical instrument for measuring light properties




  • Principle = dispersion of light into spectrum




  • Applications: astronomy, chemistry, physics experiments, industrial analysis




  • Not to be confused with microscope, telescope, or oscilloscope




👉 Correct Answer: Option 3 – Spectroscope

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