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what will be the focal lenght of a combined lens made by contact of two lenses of power +3D and -2D.​
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what will be the focal lenght of a combined lens made by contact of two lenses of power +3D and -2D.​

User Nolabel
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1 Answer

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  • P_1=+3D
  • P_2=-2D


\\ \bull\tt\dashrightarrow P=P_1+P_2


\\ \bull\tt\dashrightarrow P=+3D-2D=+1D

Now


\\ \bull\tt\dashrightarrow f=(1)/(P)


\\ \bull\tt\dashrightarrow f=(1)/(1)


\\ \bull\tt\dashrightarrow f=1m

User Uthman Rahimi
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