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WorksheetsOptics-3
Total questions: 10
Worksheet time: 5mins
The focal length of a zone plate for red colour is
greater than violet
greater than green
greater than yellow
smaller than violet
The area of the nth order zone in a zone plate is
varies as n
varies as n2
varies as 1/n
not varies with n
The phenomenon of bending of light passing through the obstacle is
polarization
interference
refraction
diffraction
In the Fraunhofer diffraction the
source of light and aperture are at infinite distance
screen and aperture are at infinite distance
source of light and obstacle are at infinite distance
All the above
The diffraction bands are obtained due to
interference of the secondary wavelets
interference of light waves from two coherent sources
interference of light waves from two non coherent sources
Which statement is correct
Interference fringe width are non uniform
Interference fringe width are uniform
diffraction band width increases at higher order
The head of the last phasor just reaches the tail of the first phasor net amplitude E =0. This correspond to
First minimum in the diffraction pattern
First maximum in the diffraction pattern
First minimum in the interference pattern
Nothing
Resolving power of the grating depends on
wavelength
angle
order of fringe
In the grating a+b is called as
grating element
grating width
grating order
Number of lines per grating
Resolving power of the grating depends on
wavelength
order of fringe
grating width
diameter of the telescope objective
