Question

14. A screen is placed 50 cm from a single slit,
which is illuminated with 6000 A light. if
distance between the first and third minima in
the diffraction pattern is 3.0 mm, then the width
of the slit is
1) 0.1 mm 2) 0.2 mm 3) 0.4 mm 4) 0.8 mm​

Answer 1

Note: Check this attachment!

Therefore,

Correct option: (2) 0.2 mm

Answer 2

Correct option: (2) 0.2 mm