1.it is monochromatic
2.it is not chromatic
3.it is not observed
4.it has small angular spread.
An optically active compound
1.rotates the plane of polarised light
2.changes the direction of polarised light
3.does not allow plane polarised light to pass through
4. none of these
Light propagates rectilinearly, due to
4.origin of spectra
The refractive index of glass is 1.5 for light waves of X = 6000 A in vacuum. Its wavelength in glass is
2. 4000 Å
The velocity of light in air is 3 * 108 ms-1 and that in water is 2.2 * 108 ms” . The polarising angle of incidence is
1.should beX/2, where X is the wavelength.
2.should be of the order of wavelength.
3.has no relation to wavelength.
4.should be much larger than the wavelength.
Two slits in Young’s double slit experiment have widths in the ratio 81 :1. The ratio of the amplitudes of light waves is
When interference of light takes place
1.energy is created in the region of maximum intensity
2.energy is destroyed in the region of maximum intensity
3.Conservation of energy holds good and energy is distrubuted
4.Conservation of energy does not hold good
1.The intensity decreases in proportion with the distance squared.
2. The wavefront is parabolic.
3.The intensity at the wavelength does not depend on the distance.
4.None of these.