Active Physics S3 Interest Pack (Sample)

A deceiving glass bottle / 不老實的玻璃瓶

What you need 所用道具• 1 Water tank• 1 glass bottle of soft drink• Plenty of water

• 玻璃缸 1 個• 玻璃樽裝汽水 1 枝• 水

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Active Physics S3 Interest Pack (Sample)

What’s going on? 解 說When the bottle is placed in air, light from the soft drink refracts when it travels from the walls of the glass bottle to the air. Light from the coke appears to come from the outer edge of the glass bottle and it appears that the glass bottle is much thinner than it really is.When the bottle is placed in the liquid, light from the soft drink does not refract and passes straight through the boundary between the glass and the liquid. Hence, the view in this case shows a better approximation of the amount of soft drink in the bottle.

當玻璃瓶置於空氣中時，從汽水而來的光在通過玻璃瓶壁進入空氣時會發生折射，從汽水而來的光線就好像從玻璃瓶的外側而來，令我們產生錯覺，誤以為瓶壁比實際上的薄 (見圖)。當玻璃瓶浸沒在液體中時，從汽水而來的光直線通過玻璃瓶壁進入液體，而不會發生折射。在這個情況下，所顯示的就較接近汽水真實的分量了。

© Pearson Education Asia Limited 2015.2All rights reserved

Active Physics S3 Interest Pack (Sample)

© Pearson Education Asia Limited 2015.3All rights reserved

Active Physics S3 Interest Pack (Sample)

Beaker in beaker / 燒杯不見了

What you need 所用道具• Plenty of olive oil• 1 small beaker (200 mL)• 1 large beaker (1 L)

• 大量橄欖油• 小燒杯 (200 mL) 1 個• 大燒杯 (1 L) 1 個

© Pearson Education Asia Limited 2015.4All rights reserved

Active Physics S3 Interest Pack (Sample)

What’s going on? 解 說The olive oil used in this experiment has a refractive index very near to that of the glass. Initially, we can see the small beaker because light undergoes reflection and refraction when it travels from air to glass and from glass to air. When the small beaker is fully immersed in the oil, there is little refraction when light passes oil-glass boundaries. As a result, the small beaker seems to disappear in the oil.

實驗中所使用的油跟玻璃的折射率非常相近。當兩個燒杯內並未注入油時，我們可清楚看見小燒杯，是因為光從空氣進入玻璃，或從玻璃進入空氣時，會發生折射和反射。當小燒杯完全浸沒在油中時，光從油進入玻璃，或從玻璃進入油時便幾乎不會發生折射。結果，小燒杯便好像消失在油中。

© Pearson Education Asia Limited 2015.5All rights reserved

Active Physics S3 Interest Pack (Sample)

Inverted words / 反斗文字

What you need 所用道具• 1 Piece of paper printed with

健康富貴• 1 Piece of paper printed with

CARBON DIOXIDE• 1 Transparent plastic cylinder

• 印有直排「健康富貴」紙條一張

• 印有橫排「CARBON DIOXIDE」紙條一張

• 透明塑膠棒一根

© Pearson Education Asia Limited 2015.6All rights reserved

Active Physics S3 Interest Pack (Sample)

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Active Physics S3 Interest Pack (Sample)

What’s going on? 解 說The images formed by the acrylic rod mounted on a holder should be inverted regardless of the colours of the words. Since the words ‘DIOXIDE’ and ‘富貴’ are symmetrical about the axis of the rod (shown as the dashed lines in the figure), their images are apparently not inverted.

紙條上的文字通過透明膠棒所形成的像都是倒置的，不會受文字的顏色影響。「DIOXIDE」和「富貴」兩字看似沒有倒置，因為它們對稱於圓柱的中軸 (圖中的虛線)。

© Pearson Education Asia Limited 2015.8All rights reserved

Active Physics S3 Interest Pack (Sample)

Question 問 題An arrow is viewed through a clear solid glass sphere and the image of the arrow is inverted as shown.

如圖所示，通過一個透明的實心玻璃球來觀察一支箭頭，所觀察到的像會倒置了。

If the arrow is replaced with the number , which of the following best shows the image observed?

若以數字 取替上圖的箭頭，在下列各項中，哪一項最能代表所觀察到的像？

A.

B.

C.

D.

Answer 答 案© Pearson Education Asia Limited 2015.9All rights reserved

Active Physics S3 Interest Pack (Sample)

The sphere is just like a convex lens and forms an inverted image. Note that the image is not only laterally inverted, unlike the one formed by a cylinder.

玻璃球就像一塊凸透鏡，所成的像是倒置的。注意成像不如塑膠圓柱的成像般僅有一個方向反轉（橫向倒置）。

© Pearson Education Asia Limited 2015.10All rights reserved