In a Young's double slit experiment the intensity at a point where the path difference is λ/6 (λ being the wavelength of the light used) is I. If I0 denotes the maximum intensity. I/I0 is equal to
1/√2
√3/2
1/2
3/4
If a star is moving towards earth,then the lines are shifted towards
red
infrared
green
blue
The velocity of light in diamond, glass and water decreases in the following order:
water > glass > diamond
diamond > glass > water
diamond > water > glass
water > diamond > glass
Light of wavelength 6328 is incident on a slit having a width 0.2 mm. The width of the central maximum, measured from minimum to minimum is:
0.36 degrees
0.18 degrees
0.72 degrees
0.09 degrees
A slit of width a is illuminated by white light. The first minimum for red light will fall at 30o, when a is
3250 Å
6.5 × 10-4 mm
1.3 micron
2.6 x 10-4 mm
In Young's double slit experiment, the central bright fringe can be identified :
As it has greater intensity that the other bright fringes.
As it is wider than the other bright fringes.
As it is narrower than the other bright fringes.
By using white light instead of monochromatic light.
Two coherent monochromatic light beams of intensities I 4I are superposed. The maximum and minimum possible intensities in the resulting beam are :
5I and I
5I and 3I
9I and I
9I and 3I
In Young's double slit experiment, the seventh maximum with wavelength λ1 is at a distance d1 and the same maximum with wavelength λ2 is a distance d2. Then d1/d2
Which of the following phenomenon is not common to sound and light waves?
interference
diffraction
coherence
polarisation
Two points separated by a distance of 0.1 mm can just be inspected in a microscope when light of wavelength 6000 Å is used. If the light of wavelength 4800 Å is used, this limit of resolution will become
0.80 mm
0.12 mm
0.10 mm
0.08 mm
