This is a two part question for a laser diffraction lab: You measure a distance

Question

This is a two part question for a laser diffraction lab:

You measure a distance from diffraction to screen to be 380[mm]. What should be the angle to the first spot measured off axis, if the distance from the center spot is 1.563E+02[mm]? angle = _____________[degree] Use three significant figures or N/A, if not enough information is given.

What is the previous answer in radian? angle = _____________[radian]. Use three significant figures or N/A, if not enough information is given.

I got 24.3 degrees and 0.424 radians, however it was incorrect!

Thank you

Explanation / Answer

Take the distance to the screen as x and the distance from center spot to first spot as y
Then tan A = y/x

This gives Tan (angle) = 156.3 / 380 = 0.4113

so, angle = tan^(-1) (0.4113) = 22.3574 degrees

For radians, multiply the degrees by (pi/180). pi = 3.1415926

so, angle = 0.39021 radians

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