Bright and Dark Fringes Are Seen on a Screen When $d ^ { \prime } = \frac { d } { 2 }$

question 44

Multiple Choice

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 halved

• A)if the distance between the slits is changed to \(d ^ { \prime } = \frac { d } { 2 }\) .
• B)if the wavelength is changed to \(\lambda ^ { \prime } = 2 \lambda\) .
• C)if the distance between the slits is \(d ^ { \prime } = 2 d\) the wavelength is changed to \(\lambda ^ { \prime } = 4 \lambda\) .
• D)if any of the above occurs.
• E)only if the width of the slits is changed to \(w ^ { \prime } = 2 w\) .

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