MCQ
The rays of different colours fail to converge at a point after going through a converging lens. This defect is called:
- ASpherical aberration.
- BDistortion.
- CComa.
- ✓Chromatic aberration.
The rays of different colours fail to converge at a Point after going through a converging Lens. This defect is called chromatic oberration.
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$A.$ Atoms of each element emit characterstics spectrum.
$B.$ According to Bohr's Postulate, an electron in a hydrogen atom, revolves in a certain stationary orbit.
$C.$ The density of nuclear matter depends on the size of the nucleus.
$D.$ A free neutron is stable but a free proton decay is possible.
$E.$ Radioactivity is an indication of the instability of nuclei.
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