In Young's experiment, if separation between slits is made half, then fringe width will become
double
four times
half
remains same
If distance between light source and screen is doubled, then intensity of light will become
half
double
remains same
1/4 th
The colour of a red cloth in green light appears
red
green
orange
black
D.
black
Red colour cloth in green light will appear black.
If dopping in the P region is high, then N region
depletion layer will be more towards P
depletion layer will be more towards N
depletion layer will remain unchanged
None of the above
Focal length of a lens is +10 cm and its refractive index is 1.4, it is dipped in a liquid of refractive index 1.6, then its focal length becomes
- 16 cm
+ 32 cm
+ 16 cm
- 32 cm
If focal length of convex lens is 9 cm and that of a concave lens is -18 cm, then focal length of combination is
+ 9 cm
- 18 cm
- 9 cm
+ 18 cm
Two mirror are put at an angle of 60°C, then number of image of an object placed between the mirrors is
3
4
5
6