Question

1. You have a laser with wavelength = 638.5 nm. The grating has a slit spacing...

1. You have a laser with wavelength = 638.5 nm. The grating has a slit spacing of 0 mm. What is the angle measured for n=1?
angle is in radians


Use three sig. figs.; or use N/A, if not enough information is given.

2. You have a laser with wavelength (λ) 640 nm. You shine it through a diffraction grating of 400 lines per millimeter. (The diffraction grating doesn't change the wavelength, it simply changes the direction in a matter of speaking.) You measure the distance to a screen to be 20.3 cm. You measure the second dot in millimeters from the center dot.
What is the wavelength of the laser light?
answer in [nanometer].

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Answer #1

Answer: 1) given that d = 0 mm which does not yield theta value. So i assumed d = 1.666E-06 mm, in case you have some "d" value substitute in the following manner.

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In case of doubts please drop a comment.Thank you.

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