Home/
Competitive Exams/
JEE Main & Advanced/
Physics/
Errors and Measurements/
Question 30178
JEE Physics · Hard

Errors and Measurements: Error Analysis — Concept MCQ

Solve this quality-checked JEE multiple-choice question, then review the correct answer and explanation.

Timer-based practiceDetailed answer reviewMobile-friendly flow
Error Analysis — ConceptHardQuestion 30178

Question

To measure a very small length (like wavelength of light ≈ 500 nm), which method is appropriate?
  1. A
    Vernier caliper
  2. B
    Metre scale
  3. C
    Interferometry
    Correct
  4. D
    Screw gauge

Correct answer

Interferometry

Explanation

Wavelengths of light (hundreds of nanometres) are far below the LC of mechanical instruments. Interferometry uses wave interference to measure sub-micron lengths.

Review Errors and Measurements notesStart timed chapter practice