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Find out power of the system :-...

Find out power of the system :-

A

`+ 5 D `

B

`– 5 D `

C

`+ 10 D `

D

`– 10 D `

Text Solution

Verified by Experts

The correct Answer is:
B
`P=((1)/(f _(1))+(1)/(F_(2)))xx 100 D ` if F & f are cm
` (1)/(F_(1) )=((3)/(2) -1) (0-(1)/( -10 ))=(1) /(20) `
`(1) /( F_(2) )= ( 2-1) (-(1)/(10) -0) =-(1)/(10) `
`D= ((1)/(20) -(1)/(10))xx100 =- 5D`
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