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AP Physics 2
13.1 Reflection
BeginnerMCQConceptual20.9k
Two flat mirrors set perpendicular to each other forming an L-shape corner. Mirror 1 extends horizontally along the x-axis, and Mirror 2 extends vertically along the y-axis, meeting at an origin corner. A single thin arrow representing an incoming light ray points downward and to the right, intersecting Mirror 1 at a point. A vertical dashed normal line extends upward from Mirror 1 at the point of incidence, and the angle between the incoming ray and the dashed normal line is labeled theta. No reflected rays or construction lines are drawn beyond the point of incidence on Mirror 1. No other labels, lines, text, or axes appear.
A light ray incident on the first of two perpendicular mirrors.
A light ray in air approaches a system consisting of two flat mirrors joined at a right angle (\(90^\circ\)), as shown in the diagram. The light ray strikes Mirror 1 at an arbitrary angle of incidence \(\theta\) relative to the surface normal, where \(0^\circ < \theta < 90^\circ\), and subsequently reflects off Mirror 2. Which statement correctly describes the relationship between the direction of the light ray after its second reflection and its initial incoming direction before the first reflection, along with the correct reasoning?

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