Which of the following is a luminous object?

以下哪項是發光體？

• Glass 玻璃

• The Moon 月球

• Burning candle 燃燒中的蠟燭

• Mirror 鏡子

Which of the following ray diagrams shows an observer seeing a distant object?

以下哪幅光線圖顯示觀察者在看着遙遠的物體？

• 
• 
• 
• 

What is the angle of reflection? 反射角是多少？

• 30°

• 40°

• 50°

• 60°

• 
• 
• 
• 

• A

• B

• C

• D

John is sitting 3 m in front of a plane mirror. How far away is his image from him?

思勤坐在平面鏡前方3 m的位置，他的像距離他多遠？

• 1.5 m

• 3 m

• 6 m

• 12 m

The diagram below shows the image of a clock formed in a plane mirror. Which of the following shows the actual time at this instant? 下圖顯示時鐘在平面鏡形成的像。當時的時間是多少？

• 5:69

• 6:29

• 6:59

• 9:56

A light ray is travelling from air towards glass, as shown below. Which of the following light rays can be the possible refracted ray?

下圖中，一條光線由空氣射向玻璃。以下哪條有可能是折射線？

• A

• B

• C

• D

When a light ray travels from water to air, it bends away from the normal.

當光線由水進入空氣時，會偏離法線。

• True

• False

When a light ray travels from diamond to glass, it bends away from the normal.

當光線由鑽石進入玻璃時，會偏離法線。

• True

• False