In measurements made with spectroscopes, why is the light first sent through a narrow slit?
A) to increase the interference effects
B) to produce broad-- i.e., wide-- spectral lines on the screen
C) to increase the bending effect by the prism
D) to produce narrow spectral lines on the screen
E) to increase the amount of light hitting the prism.

Question

Quizplus · Accepted Answer

The narrow slit ensures that the light entering the spectroscope is collimated, which helps in producing narrow and well-defined spectral lines on the screen for accurate measurement.

In Measurements Made with Spectroscopes, Why Is the Light First