OPTICS AND SPECTROSCOPY

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HERE IS THE VIDEO FOR TYPES OF LENSES

COMBINATION OF THIN LENSES WITH DETAILED EXPLANATION

INTERFERENCE

Interference effects in light waves are not easy to observe because of the short
wavelengths involved. For sustained interference
in light waves to be observed, the following conditions must be met:
• The sources must be coherent—that is, they must maintain a constant phase
with respect to each other.
• The sources may be monochromatic—that is, of a single wavelength.
We now describe the characteristics of coherent sources. As we saw when we
studied mechanical waves, two sources (producing two traveling waves) are
needed to create interference. In order to produce a stable interference pattern,
the individual waves must maintain a constant phase relationship with one
another. As an example, the sound waves emitted by two side-by-side loudspeakers
driven by a single amplifier can interfere with each other because the two speakers
are coherent—that is, they respond to the amplifier in the same way at the same
time.

See HOW INTERFERENCE IS <<<<<<<< CLICK HERE

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