Q. 223.7( 3 Votes )
Convex & concave lens form images when objects are placed at different positions from the lens. The concave lens always forms a virtual & diminished image of the object irrespective the position of the object. But convex lens form real or virtual, enlarged or diminished, inverted or erect depends on the position of the object. On the other hand ray diagrams are inspired by Fermat’s Principle which states that the light travels in a straight path and takes the shortest path to travel.
Experimental observations coincide with the ray diagrams proving the Fermat’s Principle.
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