How do you set the apparatus for its minimum angle of deviation. A. Position the

Question

How do you set the apparatus for its minimum angle of deviation. A. Position the table to see spectral lines and slew telescope, with table locked, until red (which is longest wavelength therefore yielding minimum index of refraction) was as far right as possible. B. Position the telescope to see spectral lines and rotate turntable until blue (which is shortest wavelength therefore yielding minimum index of refraction) was as far left as possible. C. Position the telescope and table to see spectral lines and rotate turntable, with telescope locked, until red (which is longest wavelength therefore yielding minimum index of refraction) was as far right as possible. D. Position the table to see spectral lines and slew telescope, with table locked, until blue (which is shortest wavelength therefore yielding maximum index of refraction) was as far left as possible. I tried "D" and it was wrong

Explanation / Answer

Position the telescope to see spectral lines and rotate turntable until blue (which is shortest wavelength therefore yielding minimum index of refraction) was as far left as possible.

so option B it is

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