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WorksheetsQUIZ
Total questions: 5
Worksheet time: 3mins
In single slit diffraction of light ,if slit is made slightly narrow then diffraction pattern will be
more spreaded than previous
less spreaded than previous
disappeared
remain same as before
In Fraunhoffer diffraction the
Source of light and the screen appear to be at infinite distance from the slit
The wavefronts involved in this case are plane
Convex lenses are used to focus the diffraction fringes on the screen
All the above
In Fraunhoffer diffraction the effective distance between source of light and screen is
finite
Infinite
Depends on type of source
None of these
A Single slit of width 0.20 mm is illuminated with light of wavelength 500 nm.The observing screen is placed 80 cm from the slit. The width of central maximum will be
2 mm
1 mm
4 mm
5 mm
In a diffraction pattern by a wire, on increasing diameter of wire, fringe width
Decreases
Increases
Remain unchanged
Increasing or decreasing will depend upon wavelength
