A rectangular block of refractive index mu is placed on a printed page lying on a horizontal surface as shown in figure. Find the minimum value of mu so that the letter L on the page is not visible

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A rectangular block of refractive index mu is placed on a printed page lying on a horizontal surface as shown in figure. Find the minimum value of mu so that the letter L on the page is not visible
08
Sep
A rectangular block of refractive index mu is placed on a printed page lying on a horizontal surface as shown in figure. Find the minimum value of mu so that the letter L on the page is not visible A rectangular block of refractive index mu is placed on a printed page lying on a [...]
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