Question
Asked Dec 25, 2019
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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.

Concave Mirror
Center of Curvature
Focus
Б
Convex Mirror
Figure CQ23.2
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Concave Mirror Center of Curvature Focus Б Convex Mirror Figure CQ23.2

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Expert Answer

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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Ray Optics

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