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Consider sunlight incident on a pinhole ...

Consider sunlight incident on a pinhole of width `10^(3)Å`. The image of the pinhole seen on a screen shall be

A

a sharp white ring

B

different from a geometrical image

C

a diffused central spot, white in colour

D

diffused coloured region around a sharp central white spot.

Text Solution

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The correct Answer is:
B, D
The width of the pinhole, `a = 1000 Å` is of the same order as the wavelength of sunlight, `lambda = 4000 Å` to `7500 Å`. So, the sunlight will be diffracted on passing through the pinhole. The pattern observed on the screen shall consist of diffused colored region around a sharp central white spot (central maximum). The pattern is different from a geometrical image.
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