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The focal length of a less is given by t...

The focal length of a less is given by the formula `(1)/(f)=(1)/(u)+(1)/(v)`. Make f as the subject of the formula.
if `u=20cm` and v=30, then find f.
The following steps are involved in solving the above problem. Arrange them in sequential order.
(A) Given `(1)/(f)=(1)/(u)+(1)/(v)`
(B) `rArr f=(uv)/(u+v)`
(C) `f=(20xx30)/(20+30)=(600)/(50)=12`cm.
(D) `rArr (1)/(f)=(v+u)/(uv)`

A

DBAC

B

DACB

C

DABC

D

DCBA

Text Solution

Verified by Experts

The correct Answer is:
C
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Knowledge Check

  • Directions for questions : Select the correct answer from the given options. The focal length of a mirror is given by the formula (1)/(f) = (1)/(mu) + (1)/( v) . Make f fast the subject of the formula. If u = 20 "cm" and v = 30 "cm" , then find f . The following seeps are involved in solving the above problem. Arrange chem in sequential order. A Given (1)/(f) = (1)/( u ) + (1)/(v) B rArr f = (uv)/( u+v) C f = (20 xx 30)/( 20 + 30) = (600)/(50) = 12 cm D rArr (1)/( f) = (v+u)/( uv)

    A
    ADBC
    B
    BADC
    C
    ACDB
    D
    DBAC

  • 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)`

  • 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)`

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    If (1)/(f)=(1)/(u)+(1)/(v) , then make v as the subject o the foormula. Also find v, if u=12 units and f=3 units

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