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Find the value of f in (1)/(f) = (1)/(u)...

Find the value of f in `(1)/(f) = (1)/(u) + (1)/(v)` wen u = 15 and v = 10.

A

`-6`

B

`1//6`

C

`6`

D

`- ((1)/(6)) `

Text Solution

Verified by Experts

The correct Answer is:
C
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According to lens formual we have (1)/(v) + (1)/(u) = (1)/(f) , where u = distance of the object from the lens, v = distance of the image from the lens and f = focal length of given lens.

Knowledge Check

  • The focal f to a mirror is given by (1)/(f) = (1)/(u) + (1)/(v) where u and v represent object and image distance respectively then

    A
    `(Delta f)/(f) = (Delta u)/(u) + (Delta v)/(v)`
    B
    `(Delta f)/(f) = (Delta u)/(v) + (Delta v)/(u)`
    C
    `(Delta f)/(f) = (Delta u)/(u) + (Delta v)/(v)- (Delta(u +v))/(u +v)`
    D
    `(Delta f)/(f) = (Delta u)/(u) + (Delta v)/(v)+ (Delta u)/(u + v) +(Delta v)/(u+v)`

  • If (1)/(f) = (1)/(u) +(1)/(v) then make v as the subject of the formula.

    A
    ` v= (u-f)/(uf)`
    B
    ` v= (f-u)/(fu)`
    C
    ` v= (uf)/(u-f)`
    D
    ` v= (uf)/(u+f)`

  • Directions for questions : Select the correct answer from the given options. Make v as the subject of the formula (1)/( f) = (1)/( u) + (1)/( v) . The following steps are involved in solving the above problem. Arrange them in sequential order. A (1)/( v) = (1)/(f) - (1)/(u) B (1)/( v) = ( u -f)/( fu) C v = (fu)/( u-f) D (1)/( u ) + (1)/( v) = (1)/(f)

    A
    DBAC
    B
    DACB
    C
    DABC
    D
    DCBA

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