Is U of convex lens positive or negative?
question_answer Answers(3) According to Cartesian sign convention, object distances (u) are always negative as the object is placed to the left of the mirror/lens. Focal length (f) is positive for a convex lens and convex mirror. Focal length is negative for concave lens and concave mirror.
What is the sign of V in convex and concave lens?
And for image distance, V in lens it is taken as positive in Convex lens since image is formed on +X side. It is taken as negative in Concave lens since image is formed in -X side of the Cartesian. In Concave mirror V is taken as positive and negative for convex mirror.
What is the sign of UV and f in convex lens?
Note: According to sign-convention, u has negative value and v has positive value for convex les. Hence, f comes positive.
How do you know if V is positive or negative?
In case of a concave lens ‘v’ is always negative. In case of convex lens it is negative or positive it depends on object distance n location.
What is the sign convention for lens?
Sign convention is a set of rules to set signs for image distance, object distance, focal length, etc for mathematical analysis of image formation. According to it: Object is always placed to the left of lens. All distances are measured from the optical centre of the mirror.
What is the sign of height of object in convex lens?
In the case of a convex mirror, always an erect image is formed, thus the height of image is taken as positive.
What happens when light passes through a convex lens?
Convex lenses refract light inward toward a focal point. Light rays passing through the edges of a convex lens are bent most, whereas light passing through the lens’s center remain straight. Convex lenses are used to correct farsighted vision. Convex lenses are the only lenses that can form real images.
What is U V f?
The equation connecting the distance between mirror and object (u), distance between mirror and image (v), and the focal length of the mirror (f) is called mirror formula.
How do you know if a lens is concave or convex?
A convex lens is thicker at the centre and thinner at the edges. A concave lens is thicker at the edges and thinner at the centre. Due to the converging rays, it is called a converging lens. Due to the diverging rays, it is called a diverging lens.
Why we take the value of U as negative in mirror formula?
because according to sign convention distance is always measured from pole which is opposite to the direction of incident ray. Hence distance of the object always negative in the mirror.
When image is positive mirror will be?
If m has a magnitude greater than 1 the image is larger than the object, and an m with a magnitude less than 1 means the image is smaller than the object. If the magnification is positive, the image is upright compared to the object; if m is negative, the image is inverted compared to the object.