$CATEGORY: Science - Khan Academy/11.Human Eye and Colourful World/11.Human Eye and Colourful World--Revision: Human eye & colourful world

//Multiple Choice

Which part of the eye helps in focusing light on the retina? {
    ~Cornea
    ~Iris
    =Lens
    ~None of the above
}

The ability of the eye to focus on objects at different distances by changing the shape of the lens is called\: {
    ~Myopia
    =Accommodation
    ~Refraction
    ~None of the above
}

Which of the following defects of vision is corrected using a concave lens? {
    =Myopia
    ~Hypermetropia
    ~Cataract
    ~None of the above
}

The splitting of white light into its constituent colors when passing through a prism is called\: {
    ~Reflection
    ~Refraction
    =Dispersion
    ~None of the above
}

The blue color of the sky is due to the phenomenon of\: {
    ~Refraction
    ~Dispersion
    =Scattering
    ~None of the above
}

Which phenomenon causes the formation of a rainbow? {
    ~Reflection
    ~Refraction
    =Dispersion and Total Internal Reflection
    ~None of the above
}

Which defect of vision is corrected by using a convex lens? {
    ~Myopia
    =Hypermetropia
    ~Astigmatism
    ~None of the above
}

Stars appear to twinkle because of\: {
    ~Dispersion of light
    ~Scattering of light
    =Atmospheric refraction
    ~None of the above
}

//True or False

The human eye can focus objects at different distances by adjusting the focal length of its lens. {T}

Hypermetropia is corrected using a concave lens. {F}

The blue color of the sky is due to the scattering of light. {T}

The twinkling of stars is caused by atmospheric refraction. {T}

Myopia is a defect where distant objects appear blurry. {T}

Dispersion of light occurs due to different speeds of light colors in a vacuum. {F}

Convex lenses are used to correct myopia. {F}

Atmospheric refraction is responsible for making the sun appear higher in the sky than it really is. {T}

The phenomenon of total internal reflection is responsible for the formation of a rainbow. {T}

In a rainbow, violet light bends the least, while red light bends the most. {F}

//Fill in the blanks



//Numericals



//Match the following

Match the following items from Column A with their correct corresponding options from Column B\:
{
=Myopia -> Concave lens
=Hypermetropia -> Convex lens
=Scattering of light -> Blue color of the sky
=Dispersion -> Splitting of white light into its component colors
=Twinkling of stars -> Atmospheric refraction
}


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