a ray of light passing through a glass prism of refracting angle 60 is deviated by an angle of 30. if the angle of emergence of light ray is 50 then the angle of incidence is
Question
a ray of light passing through a glass prism of refracting angle 60 is deviated by an angle of 30. if the angle of emergence of light ray is 50 then the angle of incidence is
Solution
To find the angle of incidence, we need to use the formula for the angle of deviation (D) in a prism, which is given by:
D = i + e - A
where: i = angle of incidence e = angle of emergence A = angle of the prism
We know that: D = 30 degrees (given) e = 50 degrees (given) A = 60 degrees (given)
Substituting these values into the formula, we get:
30 = i + 50 - 60
Solving for i, we get:
i = 30 - 50 + 60 = 40 degrees
So, the angle of incidence is 40 degrees.
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