Prisms are commonly used in spectroscopy for dispersing or controlling the direction or polarisation of light. This can be helpful for splitting the incoming light into its wavelength components to ...

PHOTO-ELECTRIC polarimeters are not yet available commercially, although several types have been described in recent years 1. Between about 4500 and 6500 A. there is no particular advantage in using ...

LASER COMPONENTS produces reflection and dispersion optical prisms. With reflection prisms, total internal reflection is used to deflect beams or rotate images. Dispersion prisms in contrast are used ...

THE Astronomer Royal, in his last communication to the Royal Astronomical Society on the Transits of Venus, adverted to the injurious effect on the observations, which might possibly arise from the ...