A convex mirror forms an image of a needle at a distance of 10 cm from it (given u = -10 cm and f = +15 cm, similar in structure to the chapter's exercise). Using the mirror formula, the image distance v is
Question
A convex mirror forms an image of a needle at a distance of 10 cm from it (given u = -10 cm and f = +15 cm, similar in structure to the chapter's exercise). Using the mirror formula, the image distance v is
v = +6 cm
v = -6 cm
v = +25 cm
v = -25 cm
Answer
v = +6 cm
Detailed Explanation
1/v = 1/f - 1/u = 1/15 - 1/(-10) = 1/15 + 1/10 = (2+3)/30 = 5/30 = 1/6, so v = +6 cm.