- AElectromagnetic radiations.
- BThe electrons orbiting around the nucleus.
- CCharged particles emitted by nucleus.
- DNeutral particles.
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
A point source of light is placed at a distance, of 2f from a converging lens of focal length f. The intensity on the other side of the lens is maximum at a distance:
The radius of curvature of convex surface of a thin plano-convex lens is 15 cm and refractive index of its material is 1.6. The power of the lens will be
|
(a) + 1D |
(b) -2D |
(c) +3D |
(d) +4D |
The focal length of the objective lens of a compound microscope is
|
(a) Equal to the focal length of its eye piece |
|
(b) Less than the focal length of eye piece |
|
(c) Greater than the focal length of eye piece |
|
(d) Any of the above three |
Consider an extended object immersed in water contained in a plane trough. When seen from close to the edge of the trough the object looks distorted because: