$CATEGORY: Science - Khan Academy/10.Light-Reflection and Refraction/10.Light-Reflection and Refraction--Refraction Of Light

//Multiple Choice

What happens to a ray of light when it passes from air into a glass slab? {
    ~It speeds up
    =It slows down
    ~It continues at the same speed
    ~None of the above
}

If the angle of incidence is equal to the angle of refraction in a glass slab, what can we conclude? {
    ~The ray is reflected
    =The ray is refracted normally
    ~The angle of incidence is zero
    ~None of the above
}

The refractive index of glass with respect to air is approximately\: {
    ~1.0
    =1.5
    ~2.0
    ~None of the above
}

What is the lateral shift when light passes through a glass slab at normal incidence? {
    =Zero
    ~Equal to the thickness of the slab
    ~Half the thickness of the slab
    ~None of the above
}

Which phenomenon causes the bending of light when it passes from one medium to another? {
    ~Reflection
    ~Diffraction
    =Refraction
    ~None of the above
}

In a glass slab, if the thickness increases, what happens to the lateral shift, assuming the angle of incidence remains constant? {
    =It increases
    ~It decreases
    ~It remains the same
    ~None of the above
}

//True or False

When light travels from air into a glass slab, it speeds up. {F}

The angle of refraction is always less than the angle of incidence when light enters a denser medium. {T}

Lateral shift occurs when light passes through a glass slab at an angle. {T}

At normal incidence, there is no lateral shift when light passes through a glass slab. {T}

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

The lateral shift increases with an increase in the thickness of the glass slab, assuming the angle of incidence remains constant. {T}

Light rays do not change direction when they pass through a glass slab. {F}

When light exits the glass slab into air, it bends towards the normal. {F}

The refractive index of glass with respect to air is approximately 1.5. {T}


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