# Concave MirrorCenter of CurvatureFocusБConvex MirrorFigure CQ23.2

Question
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The top row of Figure CQ23.2 shows three ray diagrams for
an object O in front of a concave mirror and the bottom row
shows three ray diagrams for an object O in front of a convex
mirror. In each diagram, one ray is drawn correctly and the
other is drawn incorrectly. For (a)–(f), determine whether the
red (R) or blue (B) ray is drawn correctly.

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Step 1

a)

The ray travelling through the focal point will reflect parallel to the principle axis.  The ray passing through the centre of curvature will reflect back. Thus R ray is incorrect. The B ray is correct.

Step 2

b)

The ray coming parallel to the lens will reflect through the focal length of the lens. Thus B ray is incorrect since it is reflected through the centre of curvature. The ray R is correct.

Step 3

c)

The ray traveling through the focal point will reflect parallel to the principle axis. The ray passing through the centre of curvature will reflect back in the s...

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