Question

A piece of fine fiber with a diameter of =6.5 m is used to prop apart the edges of two perfectly flat 3.3-cm-long pieces of glass (see diagram). When the setup is illuminated from above with light of wavelength =590 nm , an interference pattern of alternating bright and dark bands will be seen in the reflected light. If the setup is viewed from high above, how many dark bands will be seen?

Answer 1

We need frequency:-

$\\ \rm\Rrightarrow \nu=\dfrac{c}{\lambda}$

$\\ \rm\Rrightarrow \nu=\dfrac{3\times 10^8m/s}{590\times 10^{-9}m}$

$\\ \rm\Rrightarrow \nu=0.0051\times 10^{17}Hz$

$\\ \rm\Rrightarrow \nu=5.1\times 10^{14}Hz$