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

//Multiple Choice

The formula for magnification (m) in terms of image distance (v) and object distance (u) is
{
~ m \= u / v
~ m \= v / u
~ m \= h_i / h_o
= Both b and c
}

If a lens forms a virtual and erect image, the magnification is
{
= Positive
~ Negative
~ Zero
~ Undefined
}

For a real and inverted image formed by a lens, the magnification is
{
~ Positive
= Negative
~ Zero
~ Infinity
}

If the magnification produced by a convex lens is -2, the image is
{
= Real, inverted, and twice the size of the object
~ Virtual, erect, and twice the size of the object
~ Real, inverted, and half the size of the object
~ Virtual, erect, and half the size of the object
}

//True or False

The magnification of a lens can be both positive and negative. {T}

A magnification of -1 indicates that the image is real, inverted, and of the same size as the object. {T}

If the magnification is positive, the image formed is real. {F}

The magnification formula m \= h_i / h_o applies to both concave and convex lenses. {T}


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