The resolving power of a spectrometer consisting of collimator, a grating and a telescope can be increased by

(A) increasing the angular magnification of the telescope

(B) increasing the period of the grating

(C) decreasing the period of the grating

(D) decreasing the slit-width of the collimator
by

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The resolving power of a spectrometer consisting of collimator, a grating and a telescope can be increased by decreasing the period of the grating

by

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