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bainroot

In the leftmost picture, the camera is held at an angle above the book. In the middle picture, the camera is held lower but still above the book. In the rightmost picture, the camera is held with its lens parallel to the book, and perpendicular to the table. We notice that the table appears much brighter and reflectance is much higher.

The same idea can be observed with other surfaces. As Pat noted in lecture, we can see through water when looking at it from above, but at a glancing angle we see more reflectance.

sagoyal

@bainroot, thanks for adding comments about the location of the camera relative to the scene, I was bit confused where the Fresnel effect was coming from!