1.

Two concave lenses, eacb of focal length 30 cm are placed in contact with each other. Find the power of the combination.

Answer»

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SOLUTION :GIVEN: `f_(1)=f_(2)=-30 CM =-0.3 cm`
To find: Power of combination (P)
FORMULA: `P=(1)/(f)=(1)/(f_(1))+(1)/(f_(2))`
Calculation: From formula,
`P=(1)/(-0.3)+(1)/(0.3)=(-10)/(3)+(-10)/(3)`
`=(-20)/(3)=-6.7 D`


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