Physics

Problem

Two slits separated by

0.50\,\text{mm}

are illuminated with light of wavelength

600\,\text{nm}

. The screen is

1.5\,\text{m}

away. A glass plate of thickness

0.30\,\text{mm}

and refractive index

1.50

is placed in front of one slit. Calculate the number of fringes that will cross the central point on the screen.