Question
Physics Question on Modern Physics
In a Newton’s rings experiment (using light of free space wavelength 580nm), there is an air gap of height d between the glass plate and a plano-convex lens (see figure). The central fringe is observed to be bright.
The least possible value of d (in nm) is:
A
145
B
290
C
580
D
72.5
Answer
145
Explanation
Solution
The correct option is (A): 145