p41 068

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68.

(a) The radius of the central disk is

R =

1.22f λ

d

=

(1.22)(3.50 cm)(515 nm)

3.00 mm

= 7.33 µm .

(b) The average power flux density in the incident beam is

P

πd

2

/4

=

4(5.00 W)

π(3.00 mm)

2

= 707 kW/m

2

.

(c) The average power flux density in the central disk is

(0.84)P

πR

2

=

(0.84)(5.00 W)

π(7.33 µm)

2

= 24.9 GW/m

2

.


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