Bright and dark fringes are seen on a screen when light from a single source reaches two narrow slits a short distance apart. The number of fringes per unit length on the screen can be doubled
A)if the distance between the slits is doubled.
B)if the wavelength is changed to .
C)if the distance between the slits is quadruple the original distance and the wavelength is changed to .
D)if any of the above occurs.
E)only if the width of the slits is changed to .

Question

Bright and dark fringes are seen on a screen when light from a single source reaches two narrow slits a short distance apart. The number of fringes per unit length on the screen can be doubled
A)if the distance between the slits is doubled. 
B)if the wavelength is changed to . 
C)if the distance between the slits is quadruple the original distance and the wavelength is changed to . 
D)if any of the above occurs. 
E)only if the width of the slits is changed to .

Quizplus · Accepted Answer

The Answer of Bright and dark fringes are seen on a screen when light from a single source reaches two narrow slits a short distance apart. The number of fringes per unit length on the screen can be doubled
A)if the distance between the slits is doubled. 
B)if the wavelength is changed to . 
C)if the distance between the slits is quadruple the original distance and the wavelength is changed to . 
D)if any of the above occurs. 
E)only if the width of the slits is changed to .

Bright and Dark Fringes Are Seen on a Screen When