Fringe width is proportional to screen distance: graph or ratio

1. A.
   Graph (a)
2. B.
   Graph (b)
3. C.
   Graph (c)
4. D.
   Graph (d)

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1. A.
   $W_1 D_1 = W_2 D_2 = W_3 D_3 = W_4 D_4$
2. B.
   $\frac{W_1}{D_1} = \frac{W_2}{D_2} = \frac{W_3}{D_3} = \frac{W_4}{D_4}$
3. C.
   $\frac{W_1}{D_1} = \frac{W_2}{D_2} = \frac{W_3}{D_3} = \frac{W_3}{D_3}$
4. D.
   $D_1 W_1 = D_2 W_2 = D_3 W_3 = D_4 W_4$

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1. A.
   slope $\times d^{2}$
2. B.
   $\frac{d}{\text{~slope~}}$
3. C.
   $\frac{\text{~slope~}}{d}$
4. D.
   slope $\times d$

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