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Class 10 Science Medium Mcq English Medium

For the concave mirror case above (u = -10 cm, v = -30 cm), using the mirror formula, the focal length works out to be

Question
For the concave mirror case above (u = -10 cm, v = -30 cm), using the mirror formula, the focal length works out to be
f = -30 cm
f = -10 cm
f = -7.5 cm
f = +7.5 cm
Answer
f = -7.5 cm
Detailed Explanation
1/f = 1/v + 1/u = 1/(-30) + 1/(-10) = -1/30 - 3/30 = -4/30 = -2/15, so f = -7.5 cm.
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