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Ad libitum [116K]
2 years ago
11

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

Physics
1 answer:
4vir4ik [10]2 years ago
3 0
  • 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=\dfrac{1}{P}

\\ \bull\tt\dashrightarrow f=\dfrac{1}{1}

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

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