AI Study GuruUnderstand the idea
Light travels in straight lines, which is why a blocked beam leaves a dark region called a shadow. The shadow keeps the shape of the blocker and grows larger when the object moves closer to the light source. Materials are grouped by how much light passes through: transparent materials like clear glass let almost all light through, translucent materials like frosted glass scatter light so shapes look blurry, and opaque materials like wood block light completely and form sharp shadows. Reflection bounces light off a surface, which is how mirrors and the Moon send light to our eyes.
See a worked example
A ball held near a lamp casts a large sharp shadow because it is opaque and blocks the straight travelling light. Frosted glass glows but hides details since it is translucent. The Moon shines because it reflects sunlight; it makes no light of its own.
A useful check
Learners often say shadows prove light bends around objects. Shadows actually prove the opposite: light travels straight, so blocked regions stay dark. Also, translucent is not the same as transparent: blurry glow means translucent, clear view means transparent.
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