Find the deviation produced by reflection at a plane mirror when the angle between the incident and reflected ray is 80 degree?

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Solution

$Angle of deviation = 180^{0} - (angle between incident and reflected rays) = 180^{0} - 80^{0} = 100^{0}$

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Find the deviation produced by reflection at a plane mirror when the angle between the incident and reflected ray is 80 degree?

Angle of deviation = 1800 - angle between incident and reflected rays = 1800 - 800 =1000

$Angle of deviation = 180^{0} - (angle between incident and reflected rays) = 180^{0} - 80^{0} = 100^{0}$