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 Flower Pot Men Never Be Wrong" failed to chart in April 1968, the label had the touring band record "In A Moment of Madness" by Roger Greenaway without the involvement of Carter and Lewis, which also failed to chart. As Mark Frumento wrote in the liner notes of the retrospective Flower Pot Men album, "Listen to the Flowers Grow": ""At this point Deram decided that the Flower Pot Men name was no longer commercial and the next single, "Piccolo Man" was released under the band name 'Friends' ... The final Flower Pot Men single was released in 1969, but this time the writing