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Grade: 12 

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

Answers : (3)

Nirmal Singh.
askIITians Faculty
44 Points 
							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
6 years ago
vaanya
18 Points 
							the answer is +5cm. plz tell me how to solve it.
6 years ago
Kajal
15 Points 
							
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!! :)
one year ago
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