$CATEGORY: Science - Khan Academy/10.Light-Reflection and Refraction/10.Light-Reflection and Refraction--Refraction Of Light

//Multiple Choice

Which type of mirror always forms a virtual, erect, and diminished image?
{
= Convex mirror
~ Concave mirror
~ Plane mirror
~ None of the above
}

The focal length of a concave lens is
{
~ Positive
= Negative
~ Zero
~ Infinite
}

If the object is placed at the center of curvature of a concave mirror, the image formed is
{
~ Virtual, diminished
= Real, inverted, and of the same size
~ Virtual, erect, and enlarged
~ Real, inverted, and enlarged
}

Which type of lens converges parallel rays of light to a point?
{
= Convex lens
~ Concave lens
~ Diverging lens
~ Plane lens
}

The mirror formula is given by
{
= 1/f \= 1/v + 1/u
~ 1/f \= 1/u − 1/v
~ 1/v \= 1/f + 1/u
~ 1/f \= 1/v − 1/u
}

//True or False

A convex mirror always forms a real image. {F}

The focal length of a concave mirror is positive. {F}

A convex lens can form both real and virtual images. {T}

The magnification of a plane mirror is always equal to 1. {T}

In a concave mirror, if the object is placed beyond the center of curvature, the image formed is virtual and magnified. {F}


//Match the following

Match the following items from Column A with their correct corresponding options from Column B\:
{
=Concave mirror -> Converging mirror
=Convex lens -> Converging lens
=Convex mirror -> Diverging mirror
=Concave lens -> Virtual, erect, diminished image
=Ray diagram -> Determines image position and size
}


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