p37 003

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3.

(a) The condition for a minimum in a single-slit diffraction pattern is given by a sin θ = , where a

is the slit width, λ is the wavelength, and m is an integer. For λ = λ

a

and m = 1, the angle θ is

the same as for λ = λ

b

and m = 2. Thus λ

a

= 2λ

b

.

(b) Let m

a

be the integer associated with a minimum in the pattern produced by light with wavelength

λ

a

, and let m

b

be the integer associated with a minimum in the pattern produced by light with

wavelength λ

b

. A minimum in one pattern coincides with a minimum in the other if they occur at

the same angle. This means m

a

λ

a

= m

b

λ

b

. Since λ

a

= 2λ

b

, the minima coincide if 2m

a

= m

b

.

Consequently, every other minimum of the λ

b

pattern coincides with a minimum of the λ

a

pattern.


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