In an interference pattern the position of zeroth order maxima is 4.8 mm from a certain point P on the screen. The fringe width is 0.2 mm. The position of second maxima from point P is

Options

A. 5.1 mm
B. 5 mm
C. 40 mm
D. 5.2 mm

Answer

A

Explanation

The distance between zeroth order maxima and second order minima is
`y_(1)=(beta)/(2)+beta=(3)/(2)beta=(3)/(20xx0.2mm=0.3mm`
`therefore` The distance of second minima from point P is
`y=(4.8+0.3)mm=5.1 mm `