Light interference Can someone please answer AND give a brief explanation of why

Question

Light interference

Can someone please answer AND give a brief explanation of why tou chose that answer? Thank you so much!!

1.)

2.

Diffraction grating.The figure at right shows four slits m a diffraction grating. A set of circular wave crests is shown spreading out from cach slit Four wave paths, numbered 1 to 4. are shown leaving the slits at angle 0i The dotted lines are drawn perpendicular to the paths of the waves.1 How many extra wavelengths does wave 1 travel compared to wave 2? How many extra wavelengths docs wave 2 travel compared to wave 4?.As these four waves combine at some large distance from the grating, they will interfere.If one of the slits is covered up.(a) The pattern doesn't change shape, but it gets dimmer.(b)

Explanation / Answer

Q1)

1)B

beacuse One Wavelength. Because each semicircle wavelet represents the crest of a wavefront. The distance between wave fronts is one wavelength.

2) C

again the same reason.

3) A

Constructively, because the path length differences are all integer multiples of the same wavelength. (delta L = n lambda)

Q2) C

because the single slit diffraction pattern contains a broad central maximum. The narrower two slit interference pattern disappears in case of single slit diffraction.

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