Wave Optics

A parallel beam of monochromatic light of wavelength 600 nm passes through single slit of 0.4 mm width. Angular divergence corresponding to second order minima would be 10-3 rad.

Two slits are 1 mm apart and the screen is located 1 m away from the slits. A light of wavelength 500 nm is used. The width of each slit to obtain 10 maxima of the double slit pattern within the central maximum of the single slit pattern is 10-4 m.

Two coherent monochromatic light beams of intensities I and 4I are superimposed. The difference between maximum and minimum possible intensities in the resulting beam is x I. The value of x is .

Light emerges out of a convex lens when a source of light is kept at its focus. The shape of wavefront of the light is :

1. cylindrical
2. spherical
3. plane
4. both spherical and cylindrical

In Young's double slit experiment, carried out with light of wavelength 5000 Å, the distance between the slits is 0.3 mm and the screen is at 200 cm from the slits. The central maximum is at x = 0 cm. The value of x for third maxima is mm.

In a single slit experiment, a parallel beam of green light of wavelength 550 nm passes through a slit of width 0.20 mm. The transmitted light is collected on a screen 100 cm away. The distance of first order minima from the central maximum will be x 10-5 m. The value of x is :

Two wavelengths 1 and 2 are used in Young's double slit experiment. 1=450 nm and 2=650 nm. The minimum order of fringe produced by 2 which overlaps with the fringe produced by 1 is n. The value of n is .

The width of one of the two slits in a Young's double slit experiment is 4 times that of the other slit. The ratio of the maximum to the minimum intensity in the interference pattern is:

1. 1 : 1
2. 4 : 1
3. 16 : 1
4. 9 : 1

A monochromatic light of wavelength 6000 is incident on the single slit of width 0.01 mm. If the diffraction pattern is formed at the focus of the convex lens of focal length 20 cm, the linear width of the central maximum is :

1. 12 mm
2. 24 mm
3. 60 mm
4. 120 mm

A microwave of wavelength 2.0 cm falls normally on a slit of width 4.0 cm. The angular spread of the central maxima of the diffraction pattern obtained on a screen 1.5 m away from the slit, will be :

1. 60
2. 45
3. 15
4. 30