The critical angle for light travelling is 61 degrees
The index of refraction is a measurement of how much a light beam bends when it passes through one medium and then another. This quantity is less by one unit.
Glass has a refractive index of nG=1.52.
Water has an nW=1.33 refraction index.
The following connection gives the crucial angle for light to pass through crown glass and into the water.
C = sin⁻¹(nW/nG)
Change the values in the equation above.
αC=sin⁻¹ (1.33/1.52)
= 61.04°≈61°
As a result, about 61 degrees is the essential angle for light to pass through crown glass and into water.
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