optical

The sonification of an image of the Milky Way’s center, for instance, includes observations from the Chandra X-ray Observatory, optical images from the Hubble Space Telescope and infrared observations from the Spitzer Space Telescope.

The fall of Aleppo will be hugely tragic—“psychologically and optically devastating,” says Itani.

The acronym TOW stands for Tube-launched, Optically-tracked, Wire command link-guided missile.

Ice and water are so optically alike that unless the light fall properly upon these flowers you cannot see them.

Though closely resembling the tetragonal torbernite in form, it crystallizes in the orthorhombic system and is optically biaxial.

An interesting experiment was performed by Professor Tyndall proving that heat rays do not affect the eye optically.

If, however, you place a light at the point of projection, the shade becomes actual and can be detected optically.

Again, put yourself in the hands of an optically inclined friend, and let him operate upon you thus.