light beam
举一反三
- A beam of white light is separated into beams of various colors, ____ we conclude that white light is actually a mixture of light of these different colors.
- low beam light意思是：（ ） A: 近光灯 B: 远光灯 C: 仪表板 D: 喇叭
- Which is NOT the correct description about Laser? A: It stands for Light Amplification by Stimulated Emission. B: It’s a beam of light energy. C: All the light waves in a laser are emitted in the same rhythm. D: The light waves in a laser are of different wavelengths.
- Codes are scanned by ______. A: the checkout clerk B: the customers themselves C: a laser beam of light D: the cash register
- Choose the correct words or phrases to complete the sentences. A beam of light will not bend round corners ____ being made to do so with the help of a reflecting device.