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CBSE Class 10 Answered

a cube of edge 6 cm is placed over a printed page. At what distance from the top surface of the cube will the letters appear when seen from above?(refractive index of glass = 1.5)
Asked by nileshpatel19752000 | 11 Feb, 2016, 02:54: PM
answered-by-expert Expert Answer
The edge of the cube is 6 cm in length.
Hence, when we place the cube on the page, the distance of the letters from the top surface is the real depth of the object i.e., 6 cm.
Now, we know that,
begin mathsize 14px style straight mu equals fraction numerator Real space depth over denominator Apparent space depth end fraction therefore Apparent space depth equals fraction numerator Real space depth over denominator straight mu end fraction equals fraction numerator 6 over denominator 1.5 end fraction equals 4 space cm end style
Therefore, the letters will appear at a distance of 4 cm from the top surface of the cube when viewed from above.
Answered by Faiza Lambe | 11 Feb, 2016, 04:14: PM

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