Question

0 physics reflection and refraction of light

Answer 1

Generalized laws of reflection and refraction from transformation optics
Yadong Xu 1
, Kan Yao 1
, and Huanyang Chen 1, a)
1
School of Physical Science and Technology, Soochow University, Suzhou 215006, China
Abstract: Based on transformation optics, we introduce another set of generalized laws
of reflection and refraction (differs from that of [Science 334, 333 (2011)]), through
which a transformation media slab is derived as a meta-surface, producing anomalous
reflection and refraction for all polarizations of incident light.
The concept of phase discontinuities has inspired some thoughts on controlling light 1,2
.
The key technique is to print V-shaped antennas on a dielectric surface. The antennas will
excite cross-polarized scattered light with abrupt phase shifts from incident light. If the phase
shifts are positionally dependant, the cross-polarized scattered light will obey a set of
generalized laws of reflection and refraction, with a term of a gradient in a phase
discontinuity added, whereas the scattered light with the same polarization obeys the
conventional laws of reflection and refraction. In other words, using the V-shaped antennas,
the excited cross-polarized scattered light is controllable, while the scattered light with the
original polarization is still uncontrollable. Can we have a parallel phenomenon for all
polarizations of light? The positionally dependant phase shifts suggest the likelihood for
transformation optics to make this happen, as devices from transformation optics also possess
positionally dependant material parameters 3,4
. Furthermore, the devices from transformation
optics can control all polarizations of light when the required material parameters are fulfilled.
Here in this letter, we will revisit the aforementioned phenomenon from the perspective of
transformation optics. Another set of generalized laws of reflection and refraction will be
obtained, with anomalous reflection and refraction achieved. Moreover, two more critical
angles are derived for reflection and refraction respectively, which come from the
transformation geometry itself.
The coordinate transformation is pretty simple, as shown in schematic plot in Fig. 1(a)

Answer 2

When the light bends while travelling from 1 Medium to another, then its known as Refraction of Light However, when the light bounces back by hitting a Surface then that phenomenon is known as Reflection of light.
Also, for some greater knowledge, there is also something known as Defraction of Light.

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