Q. 184.9( 7 Votes )

Figure Q- 18 shows a point light source and its image produced by a lens with an optical axis N1N2. Find the position of the lens and is foci using a ray diagram. (AS5)


Answer :

From the given points we can infer that the image formed will be magnified according to the heights of the dots. Moreover, the image should be erect. So now we have to select the lens. For concave lens only, diminished image will be formed of the object. Thus, we cannot take the concave lens and hence convex lens is the only option. In convex lens, there is only one position of the object where the image is erect & magnified that is the image should be between focus & O. This figure represents the opposite of the given figure.


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