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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
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