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Bài 7. Hướng dẫn THTN về ánh sáng và màu sắc

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Nguồn: Sưu tầm
Người gửi: Lê Thái Trung (trang riêng)
Ngày gửi: 13h:05' 02-07-2008
Dung lượng: 681.0 KB
Số lượt tải: 34
Số lượt thích: 0 người

DISPERSION OF COLOR
(P 38 01)
Apparatus:
GSN 246
Adhesive magnetic board
1

POG 465
Ray box, 6V 20 W
1

POG 099.01
Plane mirror for color mixing
2

POG 312
Prism, glass flint equilateral
1

POG 490
Projection wedge
1


Connecting lead
2

KAL 60/5A
Power supply
1


The lamp covered by a mirror for color mixing is set up in the upper left-hand corner of the board.
The ray of "white" light passes through the optical prism placed directly in front of it. In the process the light ray is broken down into the spectral colors, red being refracted the least and violet the most.
















SPECTRAL COLORS CANNOT BE
FURTHER DISPERSED
(P 38 02)
Apparatus:
GSN 246
Adhesive magnetic board
1

POG 465
Ray box, 6V 20 W
1

POG 099.01
Plane mirror for color mixing
2

POG 312
Prism, glass flint equilateral
1

POG 310.01
Prism, right angle
1

POG 490
Projection wedge
1


Connecting lead
2

KAL 60/5A
Power supply
1


The light is set up in the lower left-hand corner of the board.
The rays of "white" light are broken down into spectral colors upon passing through the optical prism.
The edge of a second prism is placed in the rays` path as shown in the figure. The individual light rays are partially refracted and partially reflected. In neither case can a further dispersion of the spectral colors be observed.
Spectral colors thus cannot be further dispersed.

Note:
The intensity of the reflected and refracted colors as well as the degree of color saturation can be influenced by rotating the right-angled, equal-sided prism














CONVERGING SPECTRAL COLORS
TO MAKE WHITE
(P 38 03)
Apparatus:
GSN 246
Adhesive magnetic board
1

POG 465
Ray box, 6V 20 W
1

POG 099.01
Plane mirror for color mixing
2

POG 312
Prism, glass flint equilateral
1

POG 240.02
Plan-convex, lens model
1

POG 251
Semicircle, lens model
1

POG 490
Projection wedge
1


Connecting lead
2

KAL 60/5A
Power supply
1


The lamp containing a diaphragm with one slit is set up in the lower left-hand corner of the board.
A continuous spectrum is generated with the aid of the prism. A biconvex lens is formed using the planoconvex lens and the semi-circular model and placed as shown in the figure. Upon passing through the convex lens, the spectral colors are combined to form a mixed color. When a continuous spectrum enters the lens, the resulting mixed color is white.














MIXED COLOR OF A PARTIAL SPECTRUM
(P 38 04)
Apparatus:
GSN 246
Adhesive magnetic board
1

POG 465
Ray box, 6V 20 W
1

POG 099.01
Plane mirror for color mixing
2

POG 312
Prism, glass flint equilateral
1

POG 240.02
Plan-convex, lens model
1

POG 251
Semicircle, lens model
1

POG 490
Projection wedge
1

POF 220.01
Color filter, red



Connecting lead
2

KAL 60/5A
Power supply
1


A lamp containing a diaphragm with one slit is set up in the lower left-hand corner of the board. A continuous spectrum is generated with the aid of the optical prism.
A biconvex lens consisting of a planoconvex lens and a semi-circular model is positioned in the path of the rays as shown in the figure. The resulting mixed color is white.
The spectral colors violet and then the violet-blue area of the spectrum are covered up one after the other with the edge of the slit in the diaphragm. The remaining colors refracted by the lens result in a mixed color.


The experiment may be repeated beginning with red or the slit can be positioned so as to allow only the central area of the spectrum is allowed to pass through.










COMPLEMENTARY COLORS
(P 38 05)
Apparatus:
GSN 246
Adhesive magnetic board
1

POG 465
Ray box, 6V 20 W
1

POG 099.01
Plane mirror for color mixing
1

POG 312
Prism, glass flint equilateral
1

POG 310.03
Prism, right angle
1

POG 240.02
Plan-convex, lens model
1

POG 251
Semicircle, lens model
1

POG 490
Projection wedge
1

POF 220.01
Connecting lead
2

KAL 60/5A
Power supply
1






A continuous spectrum is generated with the aid of the light and the prism.
A biconvex lens is formed using the planoconvex lens and the semi-circular model, these are arranged as shown in the figure. The biconvex lens focuses the spectral colors, resulting in white. The right-angled, equal-sided prism is placed between the first prism and the lens for example within the red area of the spectrum as shown in the figure.
This area of the spectrum is refracted by the prism. Two complementary colors result when the rays pass through the lens. By moving the prism further into the spectrum, other pairs of complementary colors can be created.

Note:
This experiment may be carried out beginning with the violet end.








SUBTRACTIVE MIXING COLORS
(P 38 06)
Apparatus:
POF 251.01
Color filter disc, Substractive (CMY)
1 set


The three color filters with the subtractive primary colors cyan, magenta and yellow are partially overlapped and held against a bright surface.

Where the filters overlap, the additive primary colors red, blue and green can be observed.
























ADDITIVE MIXING COLORS
(P 38 07)
Apparatus:
GSN 246
Adhesive magnetic board
1

POG 465
Ray box, 6V 20 W
1

POF 210
Color filter, Aditive (RGB)
1

POG 099.01
Plane mirror for color mixing
3

POG 490
Projection wedge
1


Connecting lead
2

KAL 60/5A
Power supply
1


The additive color filter is inserted in front of the ray box.
Use the side that emit divergent ray and projects a divergent light beam in the three additive primary colors red, green and blue.

Using the three mirrors, the three colored beams are made to overlap on the projection wedge.
This results in the three subtractive colors cyan, magenta and yellow being produced.

White results where all three additive colors overlap.

 
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