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Class 10 Science Medium Mcq English Medium

In Example 9.3 of the chapter (concave lens, f = -15 cm, image at v = -10 cm), what is the calculated object distance u?

Question
In Example 9.3 of the chapter (concave lens, f = -15 cm, image at v = -10 cm), what is the calculated object distance u?
u = -10 cm
u = -15 cm
u = -30 cm
u = +30 cm
Answer
u = -30 cm
Detailed Explanation
Using the lens formula 1/u = 1/v - 1/f, the chapter calculates u = -30 cm, i.e., the object is placed 30 cm from the lens.
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