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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![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?](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F72a48f77-2e0a-45eb-acfa-4b8b83377f6e%2F178a5dfe-dcb5-42d4-8c50-c3a80ac54e19%2Fxiexhb_processed.jpeg&w=3840&q=75)
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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