Optics



  • IMG_20200501_162835.jpg

    Answer is A
    This is combination of lens so we are supposed to apply lens formula
    But the backside solution reveal that it must be mirror formula



  • @Pratik-Patil
    Whenever a part of combination of lenses is silvered. ...it is to be treated as a mirror.....now there is a formula to calculate the focal length of such combination ...but at the end the combination is always treated as a mirror...same in this case also......on applying mirror formula directly for given data we get the answer


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