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# Refraction through a prism

For an equilateral prism , find two angle of incidence differing by 20 degrees showing same deviation of 40 degrees?

Use the formula $\delta&space;=i_{1}+i_{2}-A$

Here A = 60 degree (Since equilateral prism)

deviation is 40 degree

This gives $A+\delta&space;=i_{1}+i_{2}=100$

Therefore,

the values of angles of incidence are 60 degree and 40 degree

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