Hold two identical combs so that one is directly in front of the other and they are about a finger-width apart. Look through the teeth and notice the patterns of light and dark that appear. This is a moire pattern. Slide the combs from side to side and watch the moire pattern move. Now rotate one comb relative to the other and notice how the pattern changes.
If you only have one comb, hold it at arm's length, about 1 inch (2.5 cm) from a mirror. Look through the comb at its reflection in the mirror. Notice how the moire pattern moves when you move the comb to the side or slowly tip one end away from the mirror.
Look through two layers of window screen. Observe the moire patterns as you slide one layer from side to side across the other, or when you rotate one layer. You can also create interesting patterns by flexing one of the screens.
If you only have one piece of screen, you can still make moire patterns - even if the screen is still mounted in a window or a door. Have a friend hold a sheet of white cardboard behind the screen, and shine a single bright light onto the screen. (On a sunny day, sunshine can serve as your light source.) Start with the cardboard touching the screen, then move it away, tilting the cardboard a little as you go. The screen will form a moire pattern with its own shadow. Replace the cardboard with flexible white paper and bend the paper. Notice how the pattern changes.
Use a copy machine to make two transparencies from the pattern of concentric circles provided with this Snack as a separate page, here. Look through these two patterns as you move them apart and then together. The moire pattern consists of radiating dark and light lines.
Hold two identical combs so that one is directly in front of the other and they are about a finger-width apart. Look through the teeth and notice the patterns of light and dark that appear. This is a moire pattern. Slide the combs from side to side and watch the moire pattern move. Now rotate one comb relative to the other and notice how the pattern changes.If you only have one comb, hold it at arm's length, about 1 inch (2.5 cm) from a mirror. Look through the comb at its reflection in the mirror. Notice how the moire pattern moves when you move the comb to the side or slowly tip one end away from the mirror.Look through two layers of window screen. Observe the moire patterns as you slide one layer from side to side across the other, or when you rotate one layer. You can also create interesting patterns by flexing one of the screens.If you only have one piece of screen, you can still make moire patterns - even if the screen is still mounted in a window or a door. Have a friend hold a sheet of white cardboard behind the screen, and shine a single bright light onto the screen. (On a sunny day, sunshine can serve as your light source.) Start with the cardboard touching the screen, then move it away, tilting the cardboard a little as you go. The screen will form a moire pattern with its own shadow. Replace the cardboard with flexible white paper and bend the paper. Notice how the pattern changes.Use a copy machine to make two transparencies from the pattern of concentric circles provided with this Snack as a separate page, here. Look through these two patterns as you move them apart and then together. The moire pattern consists of radiating dark and light lines.
การแปล กรุณารอสักครู่..
