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 Kumaraverage 69% panoramicpanoramic1140nightnight429high-speedhigh-speed418macromacro4455lens 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 54% blueblue2116greengreen1181yellowyellow2725redred7309light 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 vision3181to better see in the darkto better see in the dark13456to be more attractiveto be more attractive236it is a useless mutationit is a useless mutation600eyes 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/1.83893f/2.4f/2.4536f/2.8f/2.8841f/3.5f/3.51698photography 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 33% diffractiondiffraction1586bokehbokeh1628outfieldoutfield941overexposureoverexposure638technology riddles » What kind of camera lens is that?Macro. Small front lens elements are typical for macro lenses.Created by: globalquiz.orgeasy 71% macromacro7676telephototelephoto1566ultravioletultraviolet695underwaterunderwater812technology 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 length4176zoomzoom1359telephototelephoto940macromacro1780technology 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% AA1149BB1793Both are the sameBoth are the same9040It depends on the order of seeingIt depends on the order of seeing904illusions riddles » Play photography quiz and see all the questions.