straight - Light travels in ..................... lines, transparent - When a material allows light to travel through it, we say it is..., translucent - When a material allows some light to travel through it, we say it is..., opaque - When a material blocks light, we say it is..., luminous - When an object gives out light, we say it is..., source - The Sun is a light ............. because it gives out light, reflects - The Moon ................. the light from the Sun so we can see it, shadow - A dark shape that is formed when an object blocks a source of light, refraction - When a light ray changes direction when it enters a different medium, primary - Red, green and blue are the ............... colours of light,

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