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Focal lengthof convex mirrorispositive ornegative

The focal length can be measured using various methods, such as the thin lens equation or by measuring the distance between the lens or mirror and the image formed. Once the focal length is determined, its sign can be determined using the rules mentioned in the first question.

Yes, the sign of the focal length can change depending on the type of lens or mirror being used. For example, a convex lens will have a positive focal length, while a concave lens will have a negative focal length.

When is focal length negativein mirror

The sign of the focal length determines whether the image formed is real or virtual. A positive focal length will produce a real image, while a negative focal length will produce a virtual image.

Yes, there are a few exceptions. For example, in a concave mirror, the focal length is always negative, regardless of the direction of the light rays. Additionally, in some cases, the focal length may be considered positive or negative based on convention or the specific setup of the optical system.

The sign of the focal length can be determined by the direction in which the light rays converge or diverge. If the light rays converge, the focal length is positive, and if they diverge, the focal length is negative.