Two thin similar convex glass pieces are...

Two thin similar convex glass pieces are joined together front to front with its rear portion silvered such that a sharp image is formed 20 cm from the mirror. When the air between the glass pieces is replaced by water `(mu_(w)=4//3)`, then the image formed from the mirror is at a distance of

8 cm

10 cm

6 cm

12 cm

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Two thin similar convex glass are joined together front to front, with its rear portion silvered such that a sharp image is formed 0.2m for an object at infinity. When the air between the glass pieces is replaced by water (mu=4/3), find the position of image.

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