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Class 10 Science Medium Mcq English Medium

An object 7.0 cm tall is placed 27 cm in front of a concave mirror of focal length 18 cm. Using the mirror formula, the image distance v is

Question
An object 7.0 cm tall is placed 27 cm in front of a concave mirror of focal length 18 cm. Using the mirror formula, the image distance v is
v = -54 cm
v = +54 cm
v = -27 cm
v = -18 cm
Answer
v = -54 cm
Detailed Explanation
1/v = 1/f - 1/u = 1/(-18) - 1/(-27) = -1/18 + 1/27 = (-3+2)/54 = -1/54, so v = -54 cm.
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