query: What's so strange with this picture? Which optical phenomenon is working here?
positive_passages.docid: 147919
positive_passages.text: How does this optical illusion work?
negative_passages.docid: 84719
negative_passages.text: Why does a light beam in a moving light clock follows a V shaped path?
negative_passages.docid: 49964
negative_passages.text: Why is there a clear mirror image off a rough surface at shallow angles?
negative_passages.docid: 113532
negative_passages.text: What is the cause of this non-uniform bokeh effect?
negative_passages.docid: 34286
negative_passages.text: Intuitive explanation for why blue light is refracted more than red light?
negative_passages.docid: 33094
negative_passages.text: Why are these film photos brighter than digital photos taken at the same time with the same settings?
negative_passages.docid: 131472
negative_passages.text: What caused this pattern of lines (moire?) in this picture I scanned from a book?
negative_passages.docid: 94912
negative_passages.text: What's the origin of the flattened X that appears when of a small (but powerfull enough) light is reflected in our non-powered TV screen?
negative_passages.docid: 52389
negative_passages.text: Why does a CD work as a diffraction grating even with light from a light bulb?
negative_passages.docid: 85886
negative_passages.text: Polarization of light upon reflection
negative_passages.docid: 7505
negative_passages.text: Why is my camera drawing labyrinths on my photos?
negative_passages.docid: 132284
negative_passages.text: Why does the camera output an image with multi-colors not shown by the naked eye under the projector?
negative_passages.docid: 23937
negative_passages.text: What is the mechanism behind the slowdown of light/photons in a transparent medium?
negative_passages.docid: 12267
negative_passages.text: (Almost) double light speed
negative_passages.docid: 52326
negative_passages.text: Why does a ray passing through optical centre remain undeviated?
negative_passages.docid: 107970
negative_passages.text: Laser, wire, and a circle of light
negative_passages.docid: 18007
negative_passages.text: Why does light change direction when it travels through glass?