12/30/2023 0 Comments Glasses reflection drawing![]() One important limitation of these studies is that the front and back surfaces of the depicted objects had very little curvature, so that refractive distortions were much smaller than those that can arise from glass objects with more complicated 3D structures. This work was later extended by Schlüter and Faul ( 2014, 2016) who showed that observers can perform this task based on the pattern of specular highlights on a surface without any visible texture in the background. In one of the few experiments on this topic Fleming, Jäkel, and Maloney ( 2011) showed that subjects can match two glass surfaces against textured backgrounds by adjusting the index of refraction on one of them. ( Click to enlarge the diagram below.Although there have been a number of studies on how subsurface scattering of transmitted light influences the perception of translucency (Fleming & Bülthoff, 2005 Marlow, Kim, & Anderson, 2017 Motoyoshi, 2010 Xiao et al., 2014), much less is known about observers' perceptions of clear transparent materials. If you tilt your head sideways, this horizontally oriented glare passes through the glasses, making the surface look brighter. Polarizing sunglasses absorb this horizontally oriented glare. Horizontal surfaces in the environment, such as the asphalt of a street or the surface of a lake, reflect light that is vibrating horizontally. The reflection looks brightest when you hold the filter so it lets through just horizontally vibrating light. When the black surface is horizontal, the reflection looks dimmest when you hold the filter so it lets through just vertically vibrating light. The polarizer lets through light vibrating in one direction and absorbs light vibrating in all other directions. The horizontal black plastic reflects less light that is vibrating vertically. If the black plastic is horizontal, then it reflects light that is vibrating horizontally, creating horizontally polarized light. Nonmetallic surfaces, such as black plastic, tend to reflect light that is vibrating parallel to the surface and transmit or absorb light vibrating in all other directions. The lightbulb produces unpolarized light-each photon is vibrating in its own different direction. This is why people wear polarizing sunglasses when they go fishing. Rotate the polarizer 90 degrees from this orientation, and the surface reflections block your view of the underwater world. Rotate the polarizer and notice that at one orientation of the polarizer, the surface reflections are greatly reduced and you can see beneath the surface of the water. ![]() Look through a polarizer at the surface of a pond on a bright, sunny day. That’s because the light in the sky is polarized. Notice that in some places the brightness of the blue sky changes as you rotate the polarizer. On a sunny day, look at the sky through the polarizing lens. There should be no difference in the brightness of an image reflected in the mirror as you rotate the polarizer or vary the angle of viewing. Try looking at a reflection from a metallic surface, such as an ordinary mirror. Rotate the polarizer and change the angle of viewing to vary the brightness. Observe reflections elsewhere around you. The reflection should become notably brighter. Rotate the polarizer 90 degrees as you watch the reflection. You’ll probably get the best results when there’s about a 35-degree angle between your eyes and the piece of plastic (click to enlarge drawing below). Rotate the polarizer and vary the angle at which you look at the plastic until you get the dimmest reflection. Look at the reflection through a piece of polarizer. Orient the bulb and your eye so you can see the reflection of the bulb in the plastic. ![]() Place the lit bulb upright and the plastic plate on a flat surface nearby (see diagram).
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