A concave mirror forms a real image at 25cm from the mirror surface along the
principalaxis. If the corresponding object is at a 10cm distance what is the mirror's
focallength?
a. 1.4 cm
b. 16.7 cm
c. 12.4 cm
d. 7.1 cm
Answers
Answered by
8
Answer:
Use the mirror equation:
1/di + 1/do = 1/f
where di = +25 cm and do = +10 cm.
Substitute and solve for f.
1/(10 cm) + 1/(25 cm) = 1/f
1/f = 14/(100 cm) or 0.14/cm
f = 100/14 cm = 7.1 cm
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Answered by
1
Answer:
Therefore, correct option is D. 7.14 cm.
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