Question

Which of the following is/are the common sources of light used in interferometer?
1. Krypton 86
2. Mercury 198
3. Helium
4. All of the options

Answer 1

Correct Answer - Option 4 : All of the options

Explanation:

• When two light waves interact with each other, the wave effect leads to a phenomenon called interference of light. 
• Instruments designed to measure interference are known as interferometers.
• Application of interference is of utmost importance in metrology. 
• Interference makes it possible to accurately compare surface geometry with a master, as in the case of optical flats.
• Microscopic magnification enables micron-level resolution for carrying out inspection or calibration of masters and gauges.
• Lasers are also increasingly being used in interferometers for precision measurement. 
• Interferometers are optical instruments that are used for very small linear measurements.
• They are used for verifying the accuracy of slip gauges and measuring flatness errors.
• The common sources of light are Krypton, Mercury, Helium.