Diaphragm (optics) the lens. The centre of the diaphragm's aperture coincides with the optical axis of the lens system. Most modern cameras use a type of adjustable diaphragm known as an iris diaphragm, and often referred to simply as an iris. See the articles on aperture and f-number for the photographic effect and system of quantification of varying the opening in the diaphragm. A natural optical system that has a diaphragm and an aperture is the human eye. The iris is the diaphragm, and the opening in the iris of the eye (the pupil) is the aperture. An analogous dev in a
The Scarlet Flower called for the daughters and asked what gifts should he bring them. The eldest asked for a golden tiara adorned with precious gems that sparkled brightly, and the second wanted a crystal mirror which always showed the person's reflection as young and beautiful. The merchant knew these would be difficult to obtain, but within his means. The youngest, named Nastenka (a diminutive form of the given name Anastasia), asked for the most beautiful scarlet flower in the world, which she had seen in a dream. The merchant did not know where he could find such a flower, but promised not