Optics Question 1025

Question: Interference was observed in interference chamber when air was present, now the chamber is evacuated and if the same light is used, a careful observer will see

[CBSE PMT 1993; DPMT 2000; BHU 2002]

Options:

A) No interference

B) Interference with bright bands

C) Interference with dark bands

D) Interference in which width of the fringe will be slightly increased

Show Answer

Answer:

Correct Answer: D

Solution:

The refractive index of air is slightly more than 1. When chamber is evacuated, refractive index decreases and hence the wavelength increases and fringe width also increases.



जेईई के लिए मॉक टेस्ट

एनसीईआरटी अध्याय वीडियो समाधान

दोहरा फलक