Light : Geometric Optics - blog.uad.ac.id .Reflection (Pemantulan) Refraction (Pembiasan) Optika

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Light : Geometric Optics

Reflection (Pemantulan)

Refraction (Pembiasan)

Optika (Optics)

Spektrum Gelombang Elektromagnetik

Electromagnetic Spectrum

Electromagnetic Spectrum

Wave-Particle Duality: Light

Pemantulan pada Cermin Lengkung

(Cembung)

C

O

Object

Quiz 1

Quiz 2 A fish swims below the surface of the water at P. An observer at O sees the fish at

Reflection

Reflection is the abrupt change in the direction of propagation of a wave that strikes the boundary between two different media. At least some part of the incoming wave remains in the same medium.

Law of reflection:

The angle of reflection equals the angle of incidence.

ri

Pemantulan Cahaya

i ri

r

Pembentukan Bayangan oleh Cermin Datar

Akibat hukum pemantulan -> jarak benda sama dengan jarak bayangan

Pembentukan Bayangan oleh Cermin Datar

Pemantulan pada Bidang Lengkung

Pemantulan pada Bidang Lengkung

Pemantulan pada Cermin Lengkung

(Cembung)

C

Object

C

Pemantulan pada Cermin Lengkung

(Cekung)

Object

Image

Refraction

Refraction is the change in direction of propagation of a

wave when the wave passes from one medium into

another, and changes its speed. Light waves are

refracted when crossing the boundary from one

transparent medium into another because the speed of

light is different in different media.

This is Snell's law or

the law of refraction

Fermat's principle yields the law of refraction

)(

)(

)( 2

22

1

22

nc

dxD

nc

dxt

222

221

)( dxD

xDn

dx

xn

2211 sinsin nn

Index of Refraction

v

cn

Gejala Pembiasan