The concave lenses of these mirrors were found to form parabolic reflectors.
2.
The focal length f is considered negative for concave lenses.
3.
When a refractive error is corrected with concave lenses.
4.
Perhaps plano-concave lenses were more popular in the 70's?
5.
For X-rays a concave lens focuses the X-rays because the index of refraction is slightly below unity.
6.
Thus this laser does not need a concave lens or refocusing lenses and beam quality improves along the gain medium.
7.
Ibn al-Haytham ( Alhacen ) wrote about the effects of concave lenses, and magnifying glasses in his " Book of Optics ".
8.
For the blue wavelengths the particle behaves like a concave lens and the blue Becke ` Line moves out into the liquid.
9.
According to Schopenhauer, achromatism results when refraction occurs in one direction in the concave lens and in another direction in the convex lens.
10.
One of the most noteworthy developments in spectacle production in the 15th century was the introduction of concave lenses for the myopic or nearsighted.
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