A pair of slits is located near a screen in such a way that light incident on th

Question

A pair of slits is located near a screen in such a way that light incident on the slits can form a double slit interference pattern on the screen.
(a) Which of the following actions performed by itself would increase the angular position of the m = 4 maximum of the pattern (more than one answer may be correct)? 1 use light with a longer wavelengthuse light with a shorter wavelengthincrease the distance from the slits to the screendecrease the distance from the slits to the screenuse slits which are farther apartuse slits which are closer together        
(b) Which of the following actions performed by itself would decrease the distance along the screen between the pattern's center and the m = 4 minimum of the pattern (more than one answer may be correct)? 2 use light with a longer wavelengthuse light with a shorter wavelengthincrease the distance from the slits to the screendecrease the distance from the slits to the screenuse slits which are farther apartuse slits which are closer together Answers were wrong. Right answers both A and B??        1 use light with a longer wavelengthuse light with a shorter wavelengthincrease the distance from the slits to the screendecrease the distance from the slits to the screenuse slits which are farther apartuse slits which are closer together         1 use light with a longer wavelengthuse light with a shorter wavelengthincrease the distance from the slits to the screendecrease the distance from the slits to the screenuse slits which are farther apartuse slits which are closer together         2 use light with a longer wavelengthuse light with a shorter wavelengthincrease the distance from the slits to the screendecrease the distance from the slits to the screenuse slits which are farther apartuse slits which are closer together Answers were wrong. Right answers both A and B??        2 use light with a longer wavelengthuse light with a shorter wavelengthincrease the distance from the slits to the screendecrease the distance from the slits to the screenuse slits which are farther apartuse slits which are closer together Answers were wrong. Right answers both A and B??       

Explanation / Answer

Y = lemda*D/d

so

angular position

= lemda/d = Y/D

so

a)

use light with a longer wavelength

use slits which are closer together

b)

Y = lemda*D/d

so

use light with a shorter wavelength

decrease the distance from the slits to the screen

use slits which are farther apart

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