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 ( refractive index 4 / 3 ) then the image formed from the mirror is at a distance of

Can you pls explain this again in words i didn't understood why we took v as 20/2 and why we multiplied 4 while finding focal length
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two thin similar convex glass pieces
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For air filled combination will work as concave mirror

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Initially concave mirror
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Solution:

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Check out the attachment .....if u understood give a like

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Please find this answer

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Answer is 12cm

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