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length
size of the lens
colour
length size of the lens
One carat of diamond is equal to
One fathom is equal to how many meters ?
One kilometer is equal to how many miles?
One micron is equal to.
One nanometer is equal to
One thousand microns is equal to
One would expect proton to have very large
Optic fibre are mainly used for which of the following?
Optic fibres are used in:
Optical fiber is based upon the principle of-