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

//Multiple Choice

The principal axis of a spherical mirror is\: {
    =A straight line joining the focus and the center of curvature
    ~A curved line along the mirror's surface
    ~A line perpendicular to the mirror's surface
    ~None of the above
}

The aperture of a lens or mirror is\: {
    ~The thickness of the lens
    =The diameter of the lens or mirror
    ~The distance from the lens to the image
    ~None of the above
}

The radius of curvature of a spherical mirror is defined as\: {
    ~The distance from the focus to the mirror
    =The distance from the center of curvature to the mirror
    ~The distance from the mirror to the image
    ~None of the above
}

The center of curvature of a spherical mirror is\: {
    ~The point where light rays converge
    =The center of the sphere from which the mirror is a part
    ~The vertex of the mirror
    ~None of the above
}

The pole of a spherical mirror is\: {
    ~The center of curvature
    =The vertex of the mirror
    ~The principal focus
    ~None of the above
}

The principal focus of a concave mirror is\: {
    ~The point from which light rays appear to diverge
    =The point where parallel rays of light converge
    ~The point at infinity
    ~None of the above
}

The focal length of a lens or mirror is\: {
    ~The distance from the center of curvature to the principal focus
    ~Half the radius of curvature
    ~The distance from the focus to the pole
    =All of the above
}

For a convex mirror, the focal length is\: {
    =Positive
    ~Negative
    ~Zero
    ~None of the above
}

The distance between the pole and the principal focus of a spherical mirror is called\: {
    ~Diameter
    ~Radius of curvature
    =Focal length
    ~None of the above
}

Which of the following statements is true about the principal axis? {
    ~It is always a curved line.
    =It is perpendicular to the mirror's surface at the pole.
    ~It does not pass through the center of curvature.
    ~None of the above
}

The focal length of a spherical mirror is\: {
    ~Twice the radius of curvature
    ~Equal to the radius of curvature
    =Half the radius of curvature
    ~None of the above
}

If the radius of curvature of a spherical mirror is 30 cm, the focal length will be\: {
    =15 cm
    ~30 cm
    ~60 cm
    ~None of the above
}

//True or False

The principal axis of a spherical mirror is always a straight line. {T}

The aperture of a lens is the distance from the lens to the image. {F}

The radius of curvature is defined as the distance from the focus to the mirror. {F}

The center of curvature is the point from which the mirror is made. {T}

The pole of a mirror is the same as its focal point. {F}

The principal focus of a concave mirror is a real point. {T}

The focal length is equal to twice the radius of curvature. {F}

In a convex mirror, the focal length is considered positive. {T}

The principal axis passes through the center of curvature and the pole of the mirror. {T}

The focal length of a mirror is the distance from the center of curvature to the pole. {F}

The focal length of a concave mirror is always half the radius of curvature. {T}

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


//Fill in the blanks



//Numericals



//Match the following

Match the following items from Column A with their correct corresponding options from Column B\:
{
=Principal axis -> A Horizontal line passing through the pole and center of curvature.
=Aperture -> The maximum diameter through which light can pass
=Pole -> The vertex of the mirror
=Focal Length -> The distance between the principal focus and the pole
}

Match the following items from Column A with their correct corresponding options from Column B\:
{
=Radius of Curvature -> The distance from the center of curvature to the Pole
=Centre of Curvature -> The center of the sphere from which the mirror is a part
=Principal Focus -> The point where light rays converge or appear to diverge
=Focal Length -> The distance between the principal focus and the pole
}

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