CBSE Class 8 Answered
letter appear to be raised when reading through a thick glass
Asked by arajeevshashank | 24 Nov, 2018, 11:11: AM
Expert Answer
This is due to the refraction of light, when light travels from glass (denser medium) to air (rarer medium) as shown in figure.
Light ray AD starting from the object A placed at the bottom of glass block gets deviated along DE.
Hence for the eye it appears as the light ray is coming from B.
Hence the object appears to be at B which is at raised height.
apprent depth BC and real depth AC are related as, μ = AC / AB , where μ is refractive index of glass
Answered by Thiyagarajan K | 26 Nov, 2018, 07:45: AM
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