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

//Multiple Choice

What is a concave lens also known as?
{
~ Converging lens
= Diverging lens
~ Real image lens
~ None of the above
}

Where is the focus of a concave lens located?
{
= On the same side as the object
~ On the opposite side of the object
~ At the center of the lens
~ At infinity
}

What kind of image is formed by a concave lens when an object is placed anywhere in front of it?
{
~ Real and inverted
= Virtual and erect
~ Real and magnified
~ Virtual and inverted
}

What is the nature of the image formed by a concave lens?
{
~ Always real and diminished
= Always virtual and diminished
~ Always real and magnified
~ Always virtual and magnified
}

If parallel rays of light pass through a concave lens, they appear to diverge from a point known as the
{
~ Center of curvature
~ Principal axis
= Focal point
~ Optical center
}

Which of the following is a characteristic of a concave lens?
{
~ It can form a real and inverted image
= It always forms a virtual and erect image
~ It converges light rays
~ It forms an image larger than the object
}

When the object is placed at infinity, the image formed by a concave lens is
{
~ Real and inverted
~ Virtual and magnified
~ Real and diminished
= Virtual and diminished
}

A concave lens forms a real image only when
{
~ The object is placed at the focus
~ The object is placed beyond 2F
= It never forms a real image
~ The object is placed between F and 2F
}

//True or False

A concave lens always forms a virtual image. {T}

The image formed by a concave lens is always inverted. {F}

The focus of a concave lens is on the opposite side of the object. {F}

A concave lens can form a real image if the object is placed at the focus. {F}

The image formed by a concave lens is always smaller than the object. {T}

Parallel rays of light passing through a concave lens appear to converge at a point on the opposite side. {F}

A concave lens is also known as a diverging lens because it spreads out light rays. {T}

If an object is placed at infinity, the image formed by a concave lens is real and magnified. {F}

The image formed by a concave lens is always on the same side as the object. {T}


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