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1 光在介质中是沿直线传播的 ,光在真空中的传播速度是ｍ/ｓ,光在各种介质中传播的速度比在真空中要 . (2 0 0 1年广东省中考题 )2 我们能从各个方向看到本身不发光的物体 ,是由于光在物体表面发生反射的缘故 . (2 0 0 1年北京市朝阳区中考题 )3 入射光线与镜面的夹角为 30°
1 Light travels in a straight line in a medium. The speed of light propagation in a vacuum is m/s. The speed of light propagation in various media is higher than that in vacuum. (Guangdong Provincial Examination Questions in 2001) 2 We can see objects that do not emit light from all directions due to the reflection of light on the surface of the object. (Introductory examination questions for Chaoyang District, Beijing, 2001) 3 The angle between the incident light and the mirror is 30°.