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Which of the following is correct according to the sign conventions used for spherical mirrors?

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The object distance is always considered positive.

The height of an object above and perpendicular to the primary axis is considered negative. (-Y axis)

The height of an object below and perpendicular to the primary axis is considered positive. (+Y axis)

The focal length of a convex mirror is always positive.

answer is D.

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Detailed Solution

According to the sign conventions used for spherical mirrors, the distance measured on the right side is taken as positive.

The focus of a convex mirror is behind the mirror that is on the right side of the mirror. Therefore, the focal length of a convex mirror is always positive.

Hence the last statement is the correct answer.

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