Question

Light with wavelenth 442nm passes through a double-slit system that has a slit separation of d=0.4mm....

Light with wavelenth 442nm passes through a double-slit system that has a slit separation of d=0.4mm. Determine how far away a screen must be paced so that dark fringes appear direclty opposite both slits, with only one bright fringe between them.

a) 36.2cm

b)29.2cm

c)43.2cm

d)31.7cm

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Answer #1

wavelength = 442 x10 -9 m

Slit separation d = 0.4 x10 -3 m

distance between two dark fringes = 0.4 mm

                                                     = 0.4 x10 -3 m

We know = D / d

From this distance between screen from the slits D = d /

                                                                           = 0.362 m

                                                                           = 36.2 cm

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