concave lens

It is corrected by the use of a concave lens.

The focal length f is considered negative for concave lenses.

Concave lenses were not developed prior to the 15th century.

That is a negative number for concave lenses, which cannot really bring a light beam to a focal point.

A concave lens can push the focus back (bottom).

The concave lenses of these mirrors were found to form parabolic reflectors.

Behind their thick concave lenses, the insect dealer's questioning eyes widened in happy excitement.

It was a wonderful mechanical analogy that made understanding the effect of convex and concave lenses intuitive.

Most myopic children can be fitted with glasses with concave lenses which will bring their vision to normal.

When we look into a convex mirror or see through a concave lens, what we see is not a real image.

They're portions of concave lenses.

Thus this laser does not need a concave lens or refocusing lenses and beam quality improves along the gain medium.

He developed an occhiolino or compound microscope with a convex and a concave lens in 1609.

Replacing the small eyepiece lens in the rear end with a concave lens would make the image right-side up.

Myopia can easily be corrected with a concave lens which causes the divergence of light rays before they reach the retina.

Concave lenses have negative dioptric value and generally correct myopia (nearsightedness).

I am told that I should use a concave lens to make the image right side up, but how do I fix the magnification?

While not shown on the series, Chan was also instrumental in the creation of fire using spectacles (something not normally possible with concave lenses).

You could look in Edmund Optics for a concave lens of, say, 10mm diameter and -50mm focal length.

His eyes looked unblinkingly at Baley, shrunken a bit by the concave lenses in his spectacles.

It is magnified with convex lenses and minified with concave lenses.

For X-rays a concave lens focuses the X-rays because the index of refraction is slightly below unity.

The bubblejewel became a concave lens about three meters in diameter, within which multicolored convex lenses bubbled, each literally perfect.

"Hibiki" takes place in a dream landscape in which drops of water fall loudly into 13 concave lenses, the focal points of the piece.

Zucchi described an experiment he did with a bronze parabolic mirror he found in a cabinet of curiosities and a concave lens.