Optics questions This is a list of recently added questions about optics. What kind of photos can be made with standard zoom lens mounted in the reversed position?Macro photography may be accomplished by mounting a lens in reverse, in front of a normally mounted lens of greater focal length. This method allows most cameras to maintain the full function of electronic and mechanical communication with the normally mounted lens, for features such as open-aperture metering.Created by: Shankar Kumareasy 70% panoramicpanoramic1238nightnight471high-speedhigh-speed474macromacro5130lens riddles » The rainbow is violet on the inside of its arc. What color is it on the outside?Red. Visible light spans from red to violet. It is easy to remember, since wavelengths just outside the visible range are called infrared and ultraviolet.Created by: Hà Linh Chihard 55% blueblue2222greengreen1234yellowyellow2847redred7757light riddles » Why do cats have vertical pupils?To better see in the dark. The sharpest image is produced by round pupils, and if cats weren’t nocturnal, they probably would have round pupils like us. But the vertical pupil, in combination with horizontal eyelids, gives the cat greater and more accurate control in different types of lighting. A cat may adjust the amount of light by moving eyelids only.Created by: globalquiz.orgeasy 77% to have sharper visionto have sharper vision3336to better see in the darkto better see in the dark14227to be more attractiveto be more attractive249it is a useless mutationit is a useless mutation628eyes riddles » Which of the following camera lenses are typically more expensive?F/1.8. The smaller the f-number, the larger relative aperture there is, and that means more light for the exposure. Each aperture has half the light gathering area of the previous one.Created by: karate kidhard 55% f/1.8f/1.84058f/2.4f/2.4568f/2.8f/2.8883f/3.5f/3.51776photography riddles » What term would photographers use to describe the quality of blurred part of the photo? Bokeh has been defined as "the way the lens renders out-of-focus points of light". It can be good or unpleasant, depending on the lens aberrations and aperture shape. The term comes from Japanese for "blur".Created by: globalquiz.orgvery hard 34% diffractiondiffraction1645bokehbokeh1693outfieldoutfield975overexposureoverexposure660technology riddles » What kind of camera lens is that?Macro. Small front lens elements are typical for macro lenses.Created by: globalquiz.orgeasy 72% macromacro8661telephototelephoto1689ultravioletultraviolet742underwaterunderwater873technology riddles » What kind of lens was most likely used for this photo?Fixed focal length. Such shallow depth-of-field is possible with lens of large aperture size (small f-number). The large aperture is a typical feature (and advantage) of a fixed focal length lens. The photo was taken with a 50mm f/1.4 lens. Created by: Debbie Foxhard 50% fixed focal lengthfixed focal length4542zoomzoom1454telephototelephoto1004macromacro1944technology riddles » Which area is brighter?Both are the same. This is the well known checker shadow illusion, first published in 1995 by Edward H. Adelson, Professor of Vision Science at MIT. The area A appears darker because of its light surrounding. At the same time, area B, surrounded with dark areas, appear lighter.Created by: globalquiz.orgeasy 70% AA1176BB1851Both are the sameBoth are the same9386It depends on the order of seeingIt depends on the order of seeing939illusions riddles » Play photography quiz and see all the questions.