the focal length of a plano-concave lens is -10cm, then its focal length when its plane surface is polished is?

Question

Nirmal Singh. · Answer

When Plane surface is polished then it bahave like a concave mirror and it focal length will be - 10 cm Regards, NIrmal Singh Askiitians Faculty

vaanya · Answer

the answer is +5cm. plz tell me how to solve it.

Kajal · Answer

Any lens + plane mirror = -1/2 (f) =-1/2 (-10) =+5 =Ans its ans shortcut by our physics teacher , don't tell him that i have leaked this awesome shortcut!! :)

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the focal length of a plano-concave lens is -10cm, then its focal length when its plane surface is polished is?

the focal length of a plano-concave lens is -10cm, then its focal length when its plane surface is polished is?

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