A convex lens is made of 3 layers of glass of 3 different materials as in the figure.

A point object is placed on its axis. The number of images of the object are

• A

  3
• B

  4
• Correct answer
  C

  1
• D

  2

Solution

From the given diagram, we see that lenses $L_{1}$ and $L_{3}$ are identical but eontribute opposite sease, hence their combined effect of making image is ineffoctive. Hence, only lens $L_{g}$ forms the image.

Hence, the correct answer is option: 'C'.