$CATEGORY: Science - Khan Academy/11.Human Eye and Colourful World/11.Human Eye and Colourful World--Defects of Vision and Their Correction

//Multiple Choice

Myopia (short-sightedness) occurs when\: {
    ~The eyeball is too short
    =The eyeball is too long
    ~The lens is too flat
    ~None of the Above
}

What is the corrective lens used for myopia? {
    ~Convex lens
    =Concave lens
    ~Cylindrical lens
    ~None of the Above
}

Hypermetropia (far-sightedness) occurs when\: {
    ~The image is formed in front of the retina
    =The image is formed behind the retina
    ~The cornea becomes less transparent
    ~None of the Above
}

Which lens is used to correct hypermetropia (far-sightedness)? {
    ~Concave lens
    =Convex lens
    ~Cylindrical lens
    ~None of the Above
}

What does the high power of a lens indicate? {
    ~Longer focal length
    =Shorter focal length
    ~Thicker lens
    ~None of the Above
}

//True or False

Myopia occurs when the image is formed behind the retina. {F}

A concave lens is used to correct hypermetropia. {F}

Short-sightedness is also known as myopia. {T}

People with hypermetropia have difficulty seeing distant objects clearly. {F}

A high-power lens has a shorter focal length. {T}

//Fill in the blanks



//Numericals



//Match the following

Match the following items from Column A with their correct corresponding options from Column B\:
{
=Myopia -> Short-sightedness
=Hypermetropia -> FarSightedness
=Concave lens -> Corrects myopia
=Low power -> Longer focal length
=farsightedness -> Convex lens
}



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