Question

How is a double slit diffraction pattern different from that of a single slit?

Answer #1

In a single slit diffraction, light spreads out in a line perpendicular to the slit. No particular interesting phenomena are observed.

But in a double slit diffraction, light diffracts when passing though the slits, but the light waves coming out from those slits interfere with each other to producte an interference pattern on the screen. The light is spread out in a line, like in the single slit, but here there is interference, producing regions of constructive (bright fringes) and destructive (dark fringes) interference and a very bright spot at the on the screen, called the central maxima.

So, looking at diffraction only, there is no difference between single slit and double slit because in both cases diffraction happen; but in a double slit there is diffraction as well as interference among the diffracted rays.

Light is diffracted through a single slit. How would the
diffraction pattern on the screen change if the slit were made
narrower? Explain.

1a. For diffraction from a single slit, sketch the expected form
of the diffraction pattern.
1b. In terms of the width of the slit, a, where would you expect
to find the first minimum? As part of your answer consider points
of the edge of the slit and in the middle of the slit, and the path
difference between light waves originating at each point to a point
on the screen that would result in destructive interference.
Explain your answer.

1. A single slit produces a diffraction pattern on a
distant screen. Show that the separation distance between the two
minima on either side of the central maximum is twice as large as
the separation distance between all the other neighbouring minima.
Compare your result to the corresponding case for a double-slit
pattern with very narrow slits. (Hint: use the formula for
intensity of single slit diffraction)
2.Two ordinary lightbulbs S1 and S2 are 1m apart, each
emitting light waves...

What happens to the width of the central diffraction pattern
(in the single slit experiment) as the slit width is changed and
why?

The distance between the first and fifth minima of a single-slit
diffraction pattern is 0.400 mm with the screen 43.0 cm away from
the slit, when light of wavelength 530 nm is used.
(a) Find the slit width. (b)
Calculate the angle θ of the first diffraction
minimum.

1.a)
A diffraction pattern is produced on a viewing screen by using a
single slit with blue light. Which of the following is true?
1)Using red light will broaden the pattern; widening the slit will
also broaden the pattern. 2)Using red light will narrow the
pattern; widening the slit will broaden the pattern. 3)Using red
light will broaden the pattern; widening the slit will narrow the
pattern. 4)Using red light will narrow the pattern; widening the
slit will also narrow...

The second-order dark fringe in a single-slit diffraction
pattern is 1.40 mm from the center of the central maximum. Assuming
the screen is 89.2 cm from a slit of width 0.660 mm and assuming
monochromatic incident light, calculate the wavelength of the
incident light.
nm

Monochromatic light of 600 nm incident on a 0.2mm wide single slit.
A diffraction pattern is appeared on a screen 130cm away from the
single slit. Calculate the fractional intensity I/Imax at a point
on the screen 5 mm from the center of the principal maximum.

Monochromatic light of 600 nm incident on a 0.2mm wide single
slit. A diffraction pattern is appeared on a screen 130cm away from
the single slit. Calculate the fractional intensity I/Imax at a
point on the screen 5 mm from the center of the principal
maximum.

Find the wavelength of the light used to produce a double slit
diffraction pattern where the second order image is 0.035 m from
the central image using a diffraction grating constant of 5.2 x
10-5 m. The screen is located 2.0 m from the slits.
Can you show this using the small angle approximation formula
please?

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