Calculating Angle of Deviation in a Prism

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To calculate the angle of deviation in a prism, first sketch a ray diagram illustrating the light entering, passing through, and emerging from the prism. The angle of deviation (D) is defined as the angle between the incident and emergent rays. After determining the angle of refraction into the glass, use geometric principles to find D by extending the lines of the incident and emergent rays. The discussion emphasizes the importance of visual representation in understanding the light's path through the prism. Proper application of these concepts will lead to the correct calculation of the angle of deviation.
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light enters the side of an equilateral crown glass (1.62) prism at an angle of incidence of 35deg determin the angleof deviation after it has passed through the prism

i don't know what equation I am supposed to use

i got the angle of refraction into the glass that is 20.74deg but i don't know what I am supposed to do know please hepl
 
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am i just supposed to add up the angle of incidence withe angle of refraction
 
allstar123 said:
am i just supposed to add up the angle of incidence withe angle of refraction

Hello allstar,to get you started sketch a ray diagram to show a ray entering,passing through and then emerging from the prism.The angle of deviation(D) is the angle between the incident and emergent rays.Extend two of the lines on your sketch to show D,the rest is geometry.
 

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