What are Tides: All celestial bodies exert a gravitational force on each other. These forces of…

What are Tides: All celestial bodies exert a gravitational force on each other. These forces of attraction between earth & other celestial bodies cause periodical variations in the level of water surface, known as tides. . 6. What is Stereoscopic fusion: If a pair of photographs is taken of an object from two slightly different positions of the camera and then viewed by an apparatus which ensures that the left eye sees only the left-hand picture & right eye is directed to the right hand picture, the two separate images of the object will fuse together is the brain to provide the observer with spatial impression. This is known as a Stereoscopic fusion