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Neerendra Ram Raj
Asked: 2022-11-08T08:17:57+05:30 In:

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 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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  1. 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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