Rigid lenses are able to replace the natural shape of the cornea with a new refracting surface.
2.
A rigid lens is able to replace the natural shape of the contact ( cornea ) with a new refracting surface.
3.
He observed that isolated incident light rays directed at an opaque card held close to the eye strike the refracting surfaces of the eye obliquely and are therefore strongly refracted.
4.
The idea of contact lenses dates to 1508 when Leonardo da Vinci submerged his face in a bowl of water and used the bowl as a refracting surface, Kelly wrote.
5.
In a uniaxial material, one ray behaves according to the normal law of refraction ( corresponding to the ordinary refractive index ), so an incoming ray at normal incidence remains normal to the refracting surface.
6.
S1 / r ( n'- n ) = 0, where r is the radius of a refracting surface, n and n'the refractive indices of the neighboring media, and S the sign of summation for all refracting surfaces.
7.
S1 / r ( n'- n ) = 0, where r is the radius of a refracting surface, n and n'the refractive indices of the neighboring media, and S the sign of summation for all refracting surfaces.
8.
In practice it is more advantageous ( after Abbe ) to determine the chromatic aberration ( for instance, that of the distance of intersection ) for a fixed position of the object, and express it by a sum in which each component conlins the amount due to each refracting surface.
9.
When the goal is photo-realism, techniques such as caustics ( to simulate light focusing by uneven light-refracting surfaces, such as the light ripples seen on the bottom of a swimming pool ), and subsurface scattering ( to simulate light reflecting inside the volumes of solid objects such as human skin ).
10.
In addition, a distinct form of double refraction occurs in cases where the optic axis is not along the refracting surface ( nor exactly normal to it ); in this case the electric polarization of the birefringent material is not exactly in the direction of the wave's electric field for the extraordinary ray.
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