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In the mirror formula, (1)/(f)=(1)/(v)+1...

In the mirror formula, `(1)/(f)=(1)/(v)+1/u,f` does not change when u is changed.

Text Solution

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The mirror formula is `(1)/(v) + 1/u =(1)/(f)`, where the symbols have standard meaning. When u is changed, v changes, but f remains constant. This is because focal length of mirror depends only on radius of curvature of the mirror.
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Similar Questions

Explore conceptually related problems

The mirror formula is (1)/(f) = (1)/(v) + (1)/(u) where symbols have standard meaning. How will focal length of mirror change when u is changed by moving the object towards or away from the mirror?

State mirror formula. How does 'f' change when object distance 'u' from the mirror is changed?

Knowledge Check

  • What is f in mirror formula (1)/(u)+(1)/(v)=(1)/(f) ?

    A
    distance of object
    B
    distance of image
    C
    focal length
    D
    None.

  • 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

  • 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

    • Similar Questions

    Explore conceptually related problems

    Derive the lens formula 1/f = 1/v -1/u for a concave lens, using the necessary ray diagram.

    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.

    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)

    Assertion:- The formula ((1)/(4)+(1)/(u)=(1)/(f)) connecting u and v for a spherical mirror is valid only for mirros whose sizes are very small compared to their radii of curvatures. Reason:- Laws of reflection are strictly valid for smaller size of of optical system.

    The mirror formula is given by 1/v+1/u=1/f where the symbols have their usual meanings. Then the lens formula is given by

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