$CATEGORY: Science - Khan Academy/9.Light-Reflection and Refraction/9.Light-Reflection and Refraction--Spherical Mirrors

//Multiple Choice

The mirror formula is given by\: {
    ~1/f \= 1/v - 1/u
    =1/f \= 1/u + 1/v  
    ~1/f \= 1/u - 1/v
    ~None of these
}

For a concave mirror, if the object is placed beyond the center of curvature, the image formed is\: {
    ~Real, inverted, and enlarged
    ~Virtual, upright, and diminished
    =Real, inverted, and diminished
    ~None of the Above
}

The focal length (f) of a convex mirror is always\: {
    =Positive
    ~Negative
    ~Zero
    ~None of the Above
}

If the magnification of a mirror is -2, the image formed is\: {
    =Real and inverted
    ~Virtual and upright
    ~Real and upright
    ~None of the Above
}

In the case of a convex mirror, as the object distance increases, the image\: {
    =Moves towards the focus and becomes smaller
    ~Moves away from the mirror and becomes smaller
    ~Moves towards the mirror and becomes larger
    ~None of the Above
}

For a convex mirror, when the object is placed at infinity, the image formed is\: {
    ~At infinity
    ~At the focus, virtual and erect
    =Between the pole and focus, virtual and erect
    ~None of the Above
}

If the focal length of a concave mirror is 20 cm, where will the image be formed if an object is placed 40 cm away from the mirror? {
    ~13.3 cm
    =26.7 cm
    ~30 cm
    ~None of the Above
}

The image formed by a concave mirror when the object is placed at the center of curvature is\: {
    ~Virtual and magnified
    =Real and of the same size as the object
    ~Real and diminished
    ~None of the Above
}

//True or False

The sign convention used in mirror formula calculations states that the object distance is always taken as positive. {F}

The mirror formula is applicable only for concave mirrors and not for convex mirrors. {F}



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