Question

(please answer the three questions below.. My answers are attached in the pic but they aren't complete answers!)

PHY: DIFFRACTION AND INTERFERENCE

Pre-Lab:

1) Two narrow slits, 50?m apart are illuminated with 500 nm ligh. What is the angle of the m =2 bright fringe in radians? In degrees?

2) Light from a helium-neon laser (? = 633 nm) passes through a circular aperture and is observed on a screen 4.0 m behind the aperture. The width of the central maximum is 2.5 cm. What is the width of the hole in mm?

3) What is the width of the slit for which the first minimum is at 0.45° when the slit is illuminated by a helium-neon laser (? = 633 nm)?

Answer 1

Answer 6-sin-ilma-sin-i( 2x500 x10-9) - sin 50 x10- θ in radians-1.146x 0.02rad 180 2) For the width of central maximum is, y << L , sin θ ~ tan θ mLλ 1x4x63 3 x 10-9-0.10128 x 10-3 m 2.5x10 width of hole is 0.1013mm

3) For the first minima, sin θ sin (045)- 633x10 Width f he slit, a- 910-0.6 10 sin (0.45 0.6x1 a 80.6um