Q14
A laser beam of wavelength 600 nm with a circular cross-section having a radius of 10 mm fails normally on a lens of radius 20 mm and focal length 10 cm. The radius of the focussed spot is approximately
A.
0.3 μm
AnswerB.
0.6 μm
C.
3.0 μm
D.
6.0 μm
Answer: Option A
Solution
Answer: Option A
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