Human eye The upper end of the range is given in terms of normal visual performance as 10 cd/m (100,000,000 or one hundred million candelas per square meter). The eye includes a lens similar to lenses found in optical instruments such as cameras and the same physics principles can be applied. The pupil of the human eye is its aperture; the iris is the diaphragm that serves as the aperture stop. Refraction in the cornea causes the effective aperture (the entrance pupil) to differ slightly from the physical pupil diameter. The entrance pupil is typically about 4 mm in diameter, although it
The Devil's Flower The Devil's Flower The Devil's Flower () is a 2010 Russian romantic fantasy film directed by Ekaterina Grokhovskaya. The main heroine of the picture Polina is pursued by strange dreams, in which she is invited to go through a living flower on the doors of an ancient castle. Trying to figure out what that means, Polina turns to her friend, fortune teller Nastya. Having visited together the archive of the local library, they steal an old book there, which contains a description of the story that Polina sees in her dreams. At the same time, some pages of the book