Gives the definition of metre in terms of wavelength of red cadmium light ___________________?
A. Newton
B. Einstein
C. Michelson
D. Galileo
A thing that emits its own light is___________________?
A thing that emits its own light is___________________?
A. luminous
B. non-luminous
C. incandescent
D. bright
Diffraction fringes are____________________?
Diffraction fringes are____________________?
A. equally spaced
B. distance between them increases
C. distance between then decreases
D. they are adjacent with no space in between
Light on passing through a Polaroid is ___________________?
Light on passing through a Polaroid is ___________________?
A. plane polarized
B. un-polarized
C. circularly polarized
D. elliptically polarized
A diffraction grating has 500 lines per mm. Its slit spacing or grating element will be equal to ____________________?
A diffraction grating has 500 lines per mm. Its slit spacing or grating element will be equal to ____________________?
A. 500 mm
B. 5 x 10-3 mm
C. 2 x 10-5 mm
D. 2 x 10-3 mm
Diffraction effect is____________________?
Diffraction effect is____________________?
A. more for a round edge
B. less for a round edge
C. more for a sharp edge
D. less for a sharp edge
A light ray traveling form rarer to denser medium suffers a phase change of__________________?
A light ray traveling form rarer to denser medium suffers a phase change of__________________?
A. 60°
B. 90°
C. 180°
D. 45°
appearance of colour in thin films is due to ____________________?
appearance of colour in thin films is due to ____________________?
A. diffraction
B. dispersion
C. interference
D. polarization
The velocity of light was determined accurately by_______________?
The velocity of light was determined accurately by_______________?
A. Newton
B. Michelson
C. Huygen
D. Young
Two sources of light are coherent if they emit rays of_______________?
Two sources of light are coherent if they emit rays of_______________?
A. same wavelength
B. same amplitude of vibration
C. same wave length with constant phase difference
D. same amplitude and wavelength