Question

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

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Answer 1

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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Answer 2

Answer:

Therefore, correct option is D. 7.14 cm.

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