When a thick glass slab is placed over printed matter, they appear to be ________ and this is due to ________ of light.
Raised; refraction
The correct answer is option 1 I.e. Raised; refraction.
When a thick glass slab is placed over printed matter, the letters appear to be raised, and this is due to the refraction of light.Refraction causes light to bend as it passes from one medium (air) into another (glass), and then back into air. This bending creates the illusion that the printed matter is higher than it actually is.
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