Question Text
Question 2 :
A lens which can form virtual as well as real images:
Question 3 :
A biconvex lens of focal length {tex} 15 \mathrm { cm } {/tex} is in front of a plane mirror. The distance between the lens and the mirror is {tex} 10 \mathrm { cm } {/tex}. A small object is kept at a distance of {tex} 30 \mathrm { cm } {/tex} from the lens. The final image is :
Question 5 :
A transparent thin plate of polaroid is placed on another similar plate such that the angle between their axes is {tex} 30 ^ { \circ } . {/tex} The ratio of intensities of the emergent light and the unpolarised light will be:
Question 7 :
Which of the following does not support wave nature of light?
Question 9 :
Two thin lenses of focal lengths {tex} f _ { 1 } {/tex} and {tex} f _ { 2 } {/tex} are in contact and coaxial. The power of combination is :
Question 10 :
A beam of electrons is used in Young's double slit experiment. If the speed of electrons is increased, then the fringe width will :
Question 11 :
When a polaroid placed in the path of light is rotated, the intensity of light appears to vary but never reduces to zero. The light is :
Question 13 :
In Young's double slit experiment, the slit separation is made 3 -fold. The fringe width becomes: