Section M, N, and O

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"Section M, N, and O"

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- Optical circle (Opt.), a graduated
circle used for the measurement of angles in optical
experiments. -- Optical square, a
surveyor's instrument with reflectors for laying off right
angles.

Op"tic*al*ly, adv. By optics or
sight; with reference to optics.

Optically active, Optically
inactive (Chem. Physics), terms used of certain
metameric substances which, while identical with each other in other
respects, differ in this, viz., that they do or do not produce right-
handed or left-handed circular polarization of light. --
Optically positive, Optically
negative. See under Refraction.

Op*ti"cian (?), n. [Cf. F.
opticien. See Optic, a.]

1. One skilled in optics. [R.] A.
Smith.

2. One who deals in optical glasses and
instruments.

Op"tics (?), n. [Cf. F.
optique, L. optice, Gr. &?; (sc. &?;).

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"Section M, N, and O"