The speed of light slows down ...
in general, the denser the material, the lower the speed of light.
(For example : air to water to glass.)
The maximum speed is in a vacuum.
It will not change. Glass slows light but does not change it frequency.
No, a light ray does not bend if it enters a glass block perpendicularly.
Nothing. The speed changes. We live in a universe where electromagnetic waves change frequency if they can't change speed (and in a vacuum they can't), and only change speed if they enter another medium like glass.
yes, most of the light will travel through, but some will reflect at a angle from where you point or place it. Also because that is how Thomas Edison saved his mother, his mother was dying and the doctor needed light to perform surgery so Edison realized that light must reflect off of glass, such as mirrors.
The line is : the word ; Equal
It will not change. Glass slows light but does not change it frequency.
It slows down.
No, a light ray does not bend if it enters a glass block perpendicularly.
It does. The light refracts when it enters one side of the glass, and then it refracts in the other direction when it leaves the other side and goes back into air. The slab of glass doesn't distort the image, because its surfaces are flat and parallel. So light leaves the glass in very nearly the same direction as it was headed when it arrived.
lenses bend light by having the light pass through the glass(or whatever material) of the lense in which the light will slow down. As the light enters the glass the very first part of the ray will slow down alowing other parts to catch up. This makes the light bend towards the normal (perpendicular to side of glass). As the light leaves the glass the oposite occurs. The light that leaves the glass goes faster leaving other parts behind and bending it away form the normal. How much the light bends depends on the shape of the lense the material of the lense and the angle that the light comes in at.
refraction of light
when the light enters into another medium, its speed changes. Hence there will be the change in the wavelength. Speed = frequency times wavelength Since the speed of light is less is glass compare to the air, its wave length will be less in glass.
The angel of the light ray emerging is called "Angle of Deviation"
If the light is entering from air or a vacuum, the light will slow down. The affect of this, if the light hits the glass at an angle, is that the direction of the light will change.
When light enters a glass block, it undergoes reflection and refraction. However at the glass air interface, refraction occurs to a larger extent than refraction and hence some of the light is reflected while the rest of it enters the glass block.
The ray of light gets refracted. Depending on the medium it is entering, it will bend either to or away from the normal. For example, if it is entering a glass block from air, it will bend towards the normal, and if it leaves a glass block and enters air it will bend away from the normal. The amount the ray bends depends on the angle of incidences and the refractive indices of the two mediums, and are governed by Snell's Law.
it decreases