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

//Multiple Choice

The bouncing back of light when it strikes a smooth surface is called\: {
    ~Refraction
    =Reflection
    ~Dispersion
    ~Diffraction
}

The angle of incidence is equal to the angle of reflection. This is stated in\: {
    ~Snell’s Law
    ~Newton’s Law
    =Law of Reflection
    ~Law of Refraction
}

The normal at the point of incidence is\: {
    ~Parallel to the mirror
    =Perpendicular to the mirror
    ~At 45° to the mirror
    ~None of the above
}

A plane mirror forms an image that is\: {
    ~Real and inverted
    =Virtual and erect
    ~Enlarged and real
    ~Diminished and real
}

If the angle of incidence is 30°, what is the angle of reflection? {
    ~15°
    =30°
    ~45°
    ~60°
}

The image formed by a plane mirror is\: {
    ~At the focus
    =Behind the mirror
    ~On the surface of the mirror
    ~In front of the mirror
}

A concave mirror forms a virtual and magnified image when the object is placed\: {
    ~At infinity
    ~At the focus
    =Between focus and pole
    ~Beyond the center of curvature
}

Which type of mirror is used in rear-view mirrors of vehicles? {
    ~Concave mirror
    ~Plane mirror
    =Convex mirror
    ~None of these
}

The nature of the image formed by a convex mirror is always\: {
    ~Real and inverted
    =Virtual and erect
    ~Real and erect
    ~Virtual and inverted
}

The focal length of a plane mirror is\: {
    ~Zero
    =Infinite
    ~Equal to its radius of curvature
    ~Cannot be determined
}

//True or False

The angle of reflection is always equal to the angle of incidence. {T}

A convex mirror can form a real image. {F}

A concave mirror can form both real and virtual images. {T}

A plane mirror always forms an inverted image. {F}

The radius of curvature is twice the focal length. {T}

Convex mirrors are used in torch reflectors. {F}

The image formed by a plane mirror is always laterally inverted. {T}

The principal axis is an imaginary line passing through the pole and focus of a mirror. {T}

A concave mirror always forms a virtual image. {F}

The focal length of a plane mirror is infinite. {T}

//Fill in the blanks

The angle of reflection is always _____ to the angle of incidence. {
    =equal
    ~greater
    ~smaller
    ~None of the above
}

A concave mirror is also known as a _____ mirror. {
    ~diverging
    =converging
    ~plane
    ~None of the above
}

A convex mirror always forms a _____ image. {
    ~real
    =virtual
    ~inverted
    ~None of the above
}

The focal length of a concave mirror is always _____. {
    ~positive
    =negative
    ~zero
    ~None of the above
}

The normal to a mirror is always _____ to the mirror surface. {
    ~parallel
    =perpendicular
    ~inclined
    ~None of the above
}

The image formed by a plane mirror is always _____. {
    ~real
    =virtual
    ~inverted
    ~None of the above
}

The center of a spherical mirror is called the _____. {
    ~pole
    ~focus
    =center of curvature
    ~None of the above
}

The distance between the pole and the focus is called _____. {
    =focal length
    ~radius of curvature
    ~aperture
    ~None of the above
}

The type of mirror used in shaving mirrors is _____. {
    ~plane mirror
    =concave mirror
    ~convex mirror
    ~None of the above
}

A convex mirror always has a _____ focal length. {
    =positive
    ~negative
    ~zero
    ~None of the above
}

//Numericals

A concave mirror has a focal length of 15 cm. If an object is placed 30 cm in front of the mirror, where will the image be formed? {
    ~10 cm
    ~15 cm
    ~30 cm
    =60 cm
}

A convex mirror has a focal length of -20 cm. Where will the image be formed if an object is placed 40 cm in front of it? {
    =-13.3 cm
    ~-20 cm
    ~-30 cm
    ~-40 cm
}

A concave mirror produces a magnification of -2. If the object is placed at 20 cm, find the image distance. {
    ~10 cm
    ~20 cm
    =40 cm
    ~60 cm
}

A concave mirror has a focal length of 10 cm. An object is placed 30 cm in front of the mirror. Find the image distance. {
    ~10 cm
    =15 cm
    ~20 cm
    ~30 cm
}

A convex mirror has a focal length of -20 cm. If an object is placed 40 cm in front of it, find the image distance. {
    ~-10 cm
    =-13.3 cm
    ~-20 cm
    ~-40 cm
}

//Match the following

Match the following items from Column A with their correct corresponding options from Column B\:
{
=Plain mirror -> Virtual & Same size image
=Concave mirror (near object) -> Magnified and virtual image
=Convex mirror -> Virtual & Diminished image
=Concave mirror (far object) -> Real & inverted image
}


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