An opaque screen with a 2 mm diameter circular hole is placed 3 m from a point source emitting light at 550 nm wavelength. How many Fresnel zones will fill the hole, as seen from a point on the optical axis at a distance 2.5 m away from the hole? Is it a bright spot or a dark spot?
An opaque screen with a 2 mm diameter circular hole is placed 3 m from a point source emitting light at 550 nm wavelength. How many Fresnel zones will fill the hole, as seen from a point on the optical axis at a distance 2.5 m away from the hole? Is it a bright spot or a dark spot?
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Transcribed Image Text:An opaque screen with a 2 mm diameter circular hole is placed 3 m from a point source emitting light at
550 nm wavelength. How many Fresnel zones will fill the hole, as seen from a point on the optical axis at
a distance 2.5 m away from the hole? Is it a bright spot or a dark spot?
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