b) Substances through which light can passeasily are called substances.
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An optical medium is a medium through which light passes. The light passing through the medium gets reflected by the inner walls and freely passes through it.
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Answer:
transparent
Explanation:
Materials like air, water, and clear glass are called transparent. When light encounters transparent materials, almost all of it passes directly through them. Glass, for example, is transparent to all visible light. Translucent objects allow some light to travel through them
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