Adiffraction pattern forms when light passes through a single slit. the wavelength of the light is 691 nm. determine the angle that locates the first dark fringe when the width of the slit is (a) 3.8 × 10-4 m and (b) 3.8 × 10-6 m.

Explanation:

Given that,

Wavelength of the light,

(a) Slit width,

The angle that locates the first dark fringe is given by :

(b) Slit width,

The angle that locates the first dark fringe is given by :

Hence, this is the required solution.

here we know that ball will drop down by total distance 3.2 m

so here we know that

now using kinematics

now in the same time it will cover horizontal distance of 0.75 m

so speed of the ball will be