Final answer:
The center to face measurement on a 10" long radius 90° elbow is 20 inches.The focal length of a mirror showing an upright image twice as large as the object 10 cm away is -10 cm, indicated by an upright and virtual image produced by a concave mirror.
Step-by-step explanation:
The correct answer is option a) 20 inches.
The center to face measurement on a 10" long radius 90° elbow can be determined by using basic trigonometry. The center to face measurement is equal to twice the radius of the elbow plus the tangent of the angle times the radius.
In this case, the radius is given as 10", and the angle is 90°. Plugging these values into the formula, we get:
- Center to face measurement = 2 * 10" + tan(90°) * 10"
- Center to face measurement = 20" + (undefined) * 10"
- Center to face measurement = 20" + (undefined)
- Center to face measurement = 20"
Therefore, the center to face measurement on a 10" long radius 90° elbow is 20 inches.