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

//Multiple Choice

The bending of light as it passes from one medium to another is called\: {
    ~Reflection
    =Refraction
    ~Dispersion
    ~None of the above
}

When light passes from air into glass, it\: {
    ~Bends away from the normal
    =Bends towards the normal
    ~Does not bend at all
    ~None of the above
}

Which of the following statements is true about refraction? {
    ~Light travels faster in a denser medium than in a rarer medium.
    =Light travels slower in a denser medium than in a rarer medium.
    ~Light travels at the same speed in all mediums.
    ~None of the above
}

A light ray passes from water (refractive index \= 1.33) into air (refractive index \= 1). The light will\: {
    ~Bend towards the normal
    =Bend away from the normal
    ~Not bend at all
    ~None of the above
}

The ratio of the speed of light in vacuum to the speed of light in a given medium is called\: {
    ~Critical angle
    =Absolute refractive index
    ~Relative refractive index
    ~None of the above
}

The phenomenon of light bending at the interface between two media is governed by\: {
    =Snell’s law
    ~Newton’s law
    ~Ohm’s law
    ~None of the above
}

The refractive index of diamond is approximately\: {
    ~1.33
    =2.42
    ~1.52
    ~None of the above
}

Snell’s law is expressed as\: {
    ~n\=1/sini
    =n\=sin⁡i/sinr
    ~sini\=sinr
    ~none of these
}

The angle of incidence is 30°, and the angle of refraction is 20°. The refractive index of the second medium with respect to the first is\: {
    =1.46
    ~0.66
    ~1.33
    ~None of the above
}

//True or False

Refraction occurs when light passes from one medium to another. {T}

Snell's law can be written as n1sin(⁡i)\=n2sin(⁡r). {T}

Light always bends towards the normal when it enters a denser medium. {T}

The angle of incidence is always greater than the angle of refraction when light moves from a rarer to a denser medium. {F}

The refractive index of air is greater than that of water. {F}

Total internal reflection occurs when the angle of incidence exceeds the critical angle. {T}

A convex lens causes light rays to diverge. {F}

When light moves from water to air, it bends away from the normal. {T}

The speed of light is the same in all mediums. {F}

The refractive index of diamond is less than that of glass. {F}


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