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.

Two thin similar convex glass are joined together front to front, with

1.	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.
Answer» Correct Answer - A::B::C It is just like a concave mirror. `\|f\|=0.2 m` `:. \|R\|=0.4 m` Focal length of this equivalent mirror is `1/F=(2(mu_2//mu_1))/R_2-(2(mu_2//mu_1-1))/R_1 ("extra points")` `=(2(4//3))/-0.4-(2(4//3-1))/(+0.4)` or `F=-0.12 m or -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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