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A glass block has a critical angle of 42° - Leaving Cert Physics - Question d - 2015
Question d
A glass block has a critical angle of 42°. Calculate the refractive index of the glass used in the block.
Worked Solution & Example Answer:A glass block has a critical angle of 42° - Leaving Cert Physics - Question d - 2015
Step 1
Calculate the refractive index using the critical angle
Answer
To determine the refractive index (n) of the glass, we can use the formula relating the critical angle (c) to the refractive index:
Given the critical angle, c = 42°, we first calculate the sine of the angle:
Now substituting the value into the equation:
Thus, the refractive index of the glass used in the block is approximately 1.493.