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Vivek Vora
Asked: 2022-11-09T17:02:02+05:30 In:

Magnitude of focal length of a spherical mirror is f and magnitude of linear magnification is `1/2`
A. If image is inverted, it is a concave mirror
B. If image is erect, it is a convex mirror
C. Object distance from the mirror may be `3 f`
D. Object distance from the mirror may be f.

Magnitude of focal length of a spherical mirror is f and magnitude of linear magnification is `1/2`
A. If image is inverted, it is a concave mirror
B. If image is erect, it is a convex mirror
C. Object distance from the mirror may be `3 f`
D. Object distance from the mirror may be f.
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1 Answer

  1. Correct Answer – A::B::C::D
    Inverted and real image is formed by concave mirror.
    Let `u= -x` , then `v= +(x/2)`
    `:. (1)/(+x//2) +(1)/(-x)=(1)/(+f)`
    `:.x=3f`
    Erect and virtual image is formed by convex mirror.
    let `u=-x`, then `v= +(x/2)`
    `(1/(-x//2))+(1)/(-x)=(1)/(+f)`
    `x= +f`.

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