Question

Q.1) A laser with a wavelength of 575 nm illuminates two narrow slits. The interference pattern from the double slits is viewed on a screen that is 1.80 m away. Over a distance of 46.0 mm there are 11.0 bright fringes with the first and last fringe situated exactly at each end of that distance. What is the spacing between the two slits? Q.2) White light (400 nm - 700 nm) diffraction pattern lights up a screen that is 1.90 m away. The diffraction grating has 648 slits per mm, which produces a rainbow of diffracted light. What is the width of the first order rainbow on the screen?

          Q.1) A laser with a wavelength of 575 nm
illuminates two narrow slits. The interference pattern from the
double slits is viewed on a screen that is 1.80 m away. Over a
distance of 46.0 mm there are 11.0 bright fringes with the first
and last fringe situated exactly at each end of that distance. What
is the spacing between the two slits?
Q.2) White light (400 nm - 700 nm) diffraction
pattern lights up a screen that is 1.90 m away. The diffraction
grating has 648 slits per mm, which produces a rainbow of
diffracted light. What is the width of the first order rainbow on
the screen?

Added by Hector R.

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