A convex lens is made up of three differ...

A convex lens is made up of three different materials as shown in the figure. For a point object placed on its axis, the number of images formed are

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The correct Answer is:

Focal length depends upon radius as
`1/f = (mu - 1) (1/(R_1) - 1/(R_2))`
Three materials are use to make a lens so three should be three focal lengths then three images will be produced.

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