Mirrors, Refraction, Reflection Flashcards
What does the law of refraction state?
When light enters a more optically dense medium it slows down and bends towards the normal
What else does the law of refraction state?
When light enters a less optically dense medium it speeds up and bends away from the normal
What is dispersion?
The process responsible for the spectrum that emerges from a triangular prism, which led to Newton’s understanding and observation of colour.
In order to achieve Total Internal Reflection in optic fibre, how would you describe the behaviour of light in the core and cladding?
Light travels more slowly in the core, which is more optically dense, so that it can be reflected back into the core when it meets the boundary at an angle greater than the critical angle
What is the order of optically dense mediums from least dense to most?
Gas (Air), Liquid (Water), Solid (Gas)
What happens when the angle of incidence is increased?
The refracted ray bends progressively further away from the normal
What is total internal reflection?
When the angle is greater than the critical angle and there is no refracted ray, instead the whole ray is reflected
Where does light bend when it enters the perspex block?
Towards the normal
Where does light bend when it leaves the perspex block?
Away from the normal
What do concave lenses do?
Bulge inwards away from the incident ray
What do convex lenses do?
Bulge outwards towards the incident ray
Which type of lens is required for myopia (short-sightedness)
Concave lens
Which type of lens is required for hyperopia (long-sightedness)
Convex lens
