CBSE
Multiple Choice QuestionsA beam of light after reflection on a plane mirror forms a real image. The beam is
convergent
divergent
parallel to axis
parallel but not to axis of mirror
Light passes through two polaroids P1 and P2 with pass axis of P2 making an angle θ with the pass axis of P1. That value of θ for which the intensity of emergent light is zero.
45°
90°
30°
60°
A beam of monochromatic light is incident on one face of an equilateral prism. The angle of incidence is 55°. If the angle of emergence is 46°, then the angle of minimum deviation will be
> 41°
< 41°
= 41°
≥ 41°
In Young's double slit experiment one slit is covered with red filter and another slit is covered by green filter, then interference pattern will be
red
green
yellow
invisible
If the angle between the axis of polarizer and the analyser is 45 degree, the ratio of the intensities of original light and the transmitted light after passing through the analyser is
2 : 1
1 : 2
2 : 3
1 : 1
In Young's double slit experiment, monochromatic light of wavelength 600 nm illuminates the pair of slits and produces an interference pattern in which two consecutive bright fringes are separated by 10 mm. Another source of monochromatic light produces the interference pattern in which of the two consecutive bright fringes are separated by 8 mm. The wavelength of light from the second source is
448 nm
450 nm
480 nm
580 nm
In Young's experiment, if separation between slits is made half, then fringe width will become
double
four times
half
remains same
Resolving power of human eye is
0.1"
1"
0.1'
1'
If distance between light source and screen is doubled, then intensity of light will become
half
double
remains same
1/4 th
When the distance between slits of Young's double slit experiment is reduced to half then the fringe middle will become
constant
four times
two times
half
