1. A light beam strikes a piece of glass at a 60.00° incident angle. The beam co

Question

1. A light beam strikes a piece of glass at a 60.00° incident angle. The beam contains two wavelengths, 449.3 nm and 700.7 nm, for which the index of refraction of the glass is 1.4822and 1.4745, respectively. What is the angle between the two refracted beams? (answer must be in angle)

2. A parallel beam of light from a He-Ne laser, with a wavelength of 650 nm, falls on two very narrow slits 0.050 mm apart. How far apart are the fringes in the center of the pattern on a screen 2.4 m away? (answer in cm)

Explanation / Answer

1) n1 sin(theta1)=n2 son (theta2)

sin 60=1.4822 sin (theta2)

theta 2=35.75

similarly for second light

theta2=35.968

difference in refracted angles=0.218

2) fringe width =2.4*650*10^-9/0.05*10^-3

fringe width=0.0312 m=3.12 cm

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