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The distance between the focus and the pole of the mirror is called
At a particular time of a day, the ratio of height of an object and the length of it’s shadow is ‘x’. Using this calculate the height of a tree if the length of the shadow of tree is L.
During the same time the ratio of the height and length of any object will be equal to that of any other including ‘x’.
Step 1- Let the height of the tree be ‘h’. The length of the tree is given as ‘L’
∴ the ratio of its height and length would be h/L
Step 2- This ratio will be the same as ‘x’
A series of fast moving still pictures can create an illusion of movement because
This happens due to a phenomenon called persistence of vision.