If there are two consecutive refracting surface one after another then we firstly take formation of image by first refracting surface and then take image position (created by first ) as object position for second refracting surface. My question is why we take image as object position for second refracting surface.

Dear student,

It is one of the most simplifying assumption which gives an accurate result. Image by 1st is taken as object for the 2nd...

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