It is known as binocular or retinal disparity to the slight difference between the two points of view provided by both eyes. The binocular disparity is the way to perceive depth and relief most used by the human brain, and is what allows to be more manipulated, becoming the basis for the creation of 3D images on flat surfaces. The brain takes these two different points of view and integrates them, thus creating an object in three dimensions.
Optical convergence
is the name of the magnitude comparing the refractive index to the focal length
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The answer is; When the planet is at A it is moving faster than at B.
This is because when the planet is closer to the sun at point A, it is experiencing a stronger gravitation, by the sun, pull than at point B. Therefore, its acceleration due to gravity at point A is higher than at point B.
