Aperture

What is the correct aperture in this light?

You need a wider aperture, or you won't get enough light reaching the film.

Glancing upward, I saw the aperture, a small blue disc, in which a star was visible.

She explained that specialists, with “devoted support” from Pakistani, Icelandic and Chilean authorities, have scrutinized satellite images, used synthetic aperture radar technology, scanned hundreds of pictures, and checked testimonials and times.

an aperture in a wall

Were the larynx of the little creature like that of the parent, the milk might—probably would—enter the windpipe and cause suffocation : but the fœtal larynx is cone-shaped, with the opening at the apex, which projects, as in the whale-tribe, into the back aperture of the nostrils, where it is closely embraced by muscles of the ‘soft palate.’

In the centre of the fleshy membrane is an aperture leading into a deep cavity, at the bottom of which is placed a prominent piston that may be retracted by muscular fibres provided for the purpose.

The door was opened — ‘on the chain.’ The old lady peered at us through an aperture of about six inches.

This telescope has a 100 cm aperture.

If the generatrix makes an angle θ to the axis, then the aperture is 2θ.