sumonasamanta2000 sumonasamanta2000

12-09-2021
Physics

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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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Аноним Аноним

12-09-2021

P_1=+3D
P_2=-2D

[tex]\\ \bull\tt\dashrightarrow P=P_1+P_2[/tex]

[tex]\\ \bull\tt\dashrightarrow P=+3D-2D=+1D[/tex]

Now

[tex]\\ \bull\tt\dashrightarrow f=\dfrac{1}{P}[/tex]

[tex]\\ \bull\tt\dashrightarrow f=\dfrac{1}{1}[/tex]

[tex]\\ \bull\tt\dashrightarrow f=1m[/tex]

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