Pada waktu pagi, cahaya matahari masuk melalui celah tingkap. Kelihatan jalur cahaya yang lurus di dalam bilik. Apakah sifat cahaya yang ditunjukkan?
光的传播 = pergerakan cahaya
光是沿着直线前进的。这个单元学习光直线传播的现象、影子怎样形成，以及影子的清晰度、大小和形状受什么影响。
例子：早上阳光从窗缝照进来，形成一条条直的光束。
注意：光遇到挡住它的东西，就会形成影子。
movement of light = pergerakan cahaya
Light travels in straight lines. This unit covers this property, how shadows form, and what affects their sharpness, size and shape.
Example: morning sunlight through a gap in the window forms straight beams.
Watch out: when light is blocked, a shadow forms.
Kenali
Cahaya bergerak lurus
Cahaya bergerak dalam garis lurus. Kita tidak dapat melihat cahaya lampu suluh melalui tiub yang dibengkokkan.
Contoh: Cahaya lampu suluh dapat dilihat melalui tiga keping kadbod berlubang hanya apabila lubang-lubangnya berada dalam satu garis lurus.
光直线前进 = cahaya bergerak lurus
光沿直线（garis lurus）前进。用弯曲的管子看手电筒，看不到光；三张打孔纸板的孔排成一直线时，才看得到手电筒的光。
例子：舞台上的聚光灯射出直直的光束。
注意：光不会自己转弯。
light travels straight = cahaya bergerak lurus
Light travels in a straight line (garis lurus). You cannot see a torch through a bent tube, and you see it through three holed cards only when the holes are in one straight line.
Example: a stage spotlight sends out a straight beam.
Watch out: light does not turn corners by itself.
Semak kefahaman
Mengapakah cahaya lampu suluh tidak kelihatan melalui hos getah yang dibengkokkan?
为什么看不到 = mengapa tidak kelihatan
管子弯了，光会跟着弯吗？想想光前进的路线是什么形状。
例子：躲在墙角后面，别人的手电筒照不到你。
注意：题目没有说电池没电。
why it cannot be seen = mengapa tidak kelihatan
The hose is bent. Does light bend along with it? Think about the shape of the path light takes.
Example: someone hiding round a corner cannot be reached by a torch beam.
Watch out: nothing says the battery is flat.
Fahami
Bayang-bayang dan kejelasannya
Bayang-bayang terbentuk apabila cahaya dihalang oleh objek. Kejelasannya bergantung pada jenis objek:
legap – bayang-bayang jelas
lut cahaya – bayang-bayang kabur
lut sinar – hampir tiada bayang-bayang
Contoh: Buku membentuk bayang-bayang gelap, kertas surih bayang-bayang kabur.
shadows and sharpness = bayang-bayang
A shadow forms when light is blocked by an object. Opaque objects (legap) block all light and make sharp shadows; translucent objects (lut cahaya) let some light through and make blurry shadows; transparent objects (lut sinar) let almost all light through and make almost no shadow.
Example: a book makes a dark shadow, tracing paper a faint one and clear glass almost none.
Watch out: shadows form because light travels straight and cannot go round objects.
matching transparency = padankan
Plywood blocks all light: opaque. Greaseproof paper lets some through: translucent. A clear glass lets all through: transparent.
Example: a wooden door is opaque.
Watch out: judge by how much light can pass through.
Fahami
Saiz dan bentuk bayang-bayang
Semakin dekat objek dengan sumber cahaya, semakin besar bayang-bayang. Bentuk bayang-bayang berubah apabila kedudukan objek atau kedudukan sumber cahaya berubah.
Contoh: Semasa wayang kulit, tok dalang menggerakkan patung lebih dekat ke lampu supaya bayang-bayang menjadi besar.
影子的大小和形状 = saiz dan bentuk
物体离光源越近，影子越大；越远，影子越小。改变物体的方向（orientasi objek）或光源的位置，影子的形状也会改变。
例子：皮影戏里，把皮影拿近灯，影子就变大。
注意：这里说的距离是物体和光源之间的距离。
shadow size and shape = saiz dan bentuk
The closer an object is to the light source, the bigger its shadow; the farther, the smaller. Turning the object (orientasi objek) or moving the light source changes the shadow's shape.
Example: in shadow puppetry, moving a puppet nearer the lamp makes its shadow bigger.
Watch out: the distance here is between the object and the light source.
Semak kefahaman
Bagaimanakah cara membuat bayang-bayang patung menjadi lebih kecil?
影子变小 = bayang lebih kecil
回想规律：物体离光源越近，影子越大。那么要影子变小，应该怎样移动？
例子：老师站得离投影机远一点，影子就小一点。
注意：颜色不会改变影子的大小。
a smaller shadow = bayang lebih kecil
Recall the rule: the closer to the light, the bigger the shadow. So how should you move the puppet for a smaller shadow?
Example: a teacher standing farther from a projector casts a smaller shadow.
Watch out: colour does not change shadow size.
Ringkasan
Syabas!
Pergerakan cahaya
Cahaya bergerak lurus. Bayang-bayang terbentuk apabila cahaya dihalang: legap jelas, lut cahaya kabur, lut sinar hampir tiada. Semakin dekat objek dengan sumber cahaya, semakin besar bayang-bayang.
