why v is negative in concave lens ?

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why v is negative in concave lens ?

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https://physics.stackexchange.com/questions/211345/rule-sign-for-concave-and-convex-lens

https://physics.stackexchange.com/questions/211345/rule-sign-for-concave-and-convex-lens
Rule sign for concave and convex lens? – Physics Stack Exchange
That is why U is always taken as negative. For focal length, f in lens is always taken as negative for concave and positive for convex. In case of mirror the f is taken as negative if it is in -X side i.e., is in Concave mirror and taken as positive if it is in +X side i.e., is in Convex mirror. And for image distance, it is taken as …

https://phys.libretexts.org/Bookshelves/University_Physics/Physics_(Boundless)/24:_Geometric_Optics/24.3:_Lenses

https://phys.libretexts.org/Bookshelves/University_Physics/Physics_(Boundless)/24:_Geometric_Optics/24.3:_Lenses
24.3: Lenses – Physics LibreTexts
The power P of a lens is defined as the inverse of its focal length. In equation form: P = 1 f (24.3.9) (24.3.9) P = 1 f. shows the effect of a concave lens on rays of light entering it parallel to its axis (the path taken by ray 2 in the figure is the axis of the lens).

https://phys.libretexts.org / Bookshelves / College_Physics / College_Physics_1e_(OpenStax) / 25:_Geometric_Optics / 25.06:_Image_Formation_by_Lenses

https://phys.libretexts.org / Bookshelves / College_Physics / College_Physics_1e_(OpenStax) / 25:_Geometric_Optics / 25.06:_Image_Formation_by_Lenses
25.6: Image Formation by Lenses – Physics LibreTexts
This is a case 3 image, formed for any object by a negative focal length or diverging lens. Figure (PageIndex{12}): A car viewed through a concave or diverging lens looks upright. This is a case 3 image. (credit: Daniel Oines, Flickr) Figure (PageIndex{13}): Ray tracing predicts the image location and size for a or diverging …

https://openstax.org/books/physics/pages/16-3-lenses

https://openstax.org/books/physics/pages/16-3-lenses
16.3 Lenses – Physics | OpenStax
Figure 16.26 Rays of light enter a concave, or diverging, lens parallel to its axis diverge and thus appear to originate from its focal point, F. The dashed lines are not rays; they indicate the directions from which the rays appear to come. The focal length, ƒ, of a diverging lens is negative.An expanded view of the path taken by ray 1 shows the perpendiculars and the angles of incidence and …

https://isaacphysics.org/pages/gcse_ch5_49_text

https://isaacphysics.org/pages/gcse_ch5_49_text
Waves – 49. Concave Lenses — Isaac Physics
Making v negative makes sense given that our image is to the left of the lens. Making f negative also makes sense as we remember that P = 1/ f and concave lenses have negative powers. For all lenses 1/ v = 1/ f − 1/ u, where a negative v means that the image is to the left of the lens, and a negative value of f means that the .

https://openstax.org/books/college-physics-2e/pages/25-6-image-formation-by-lenses

https://openstax.org/books/college-physics-2e/pages/25-6-image-formation-by-lenses
25.6 Image Formation by Lenses – College Physics 2e – OpenStax
The concave lens is a diverging lens, because it causes the light rays to bend away (diverge) from its axis. In this case, the lens has been shaped so that all light rays entering it parallel to its axis appear to originate from the same point, F F, defined to be the focal point of a diverging lens. The distance from the center of the to …

https://phys.libretexts.org/Bookshelves/University_Physics/University_Physics_(OpenStax)/University_Physics_III_-_Optics_and_Modern_Physics_(OpenStax)/02:_Geometric_Optics_and_Image_Formation/2.05:_Thin_Lenses

https://phys.libretexts.org/Bookshelves/University_Physics/University_Physics_(OpenStax)/University_Physics_III_-_Optics_and_Modern_Physics_(OpenStax)/02:_Geometric_Optics_and_Image_Formation/2.05:_Thin_Lenses
2.5: Thin Lenses – Physics LibreTexts
23 nov. 2023When the object is closer than the focal length from the lens, the image distance becomes negative, which means that the image is virtual, on the same side of the lens as the object, and upright. For a thin diverging lens of focal length (f =−1.0, cm), a similar plot of image distance vs. object distance is shown in Figure (PageIndex{10b}).

https://www.khanacademy.org/science/physics/geometric-optics/lenses/v/concave-lenses

https://www.khanacademy.org/science/physics/geometric-optics/lenses/v/concave-lenses
Concave lenses (video) | Geometric optics | Khan Academy
Concave lenses. Concave lenses, with their inward curve, create divergent light rays. When a ray parallel to the principal axis hits the lens, it refracts outward as if coming from the focal point. Another ray, passing through the lens center, doesn’t refract. These rays form a virtual, upright, and smaller image, appearing closer to the …

https://www.khanacademy.org/science/in-in-class10th-physics/in-in-10th-physics-light-reflection-refraction/in-in-sign-conventions/v/sign-conventions-for-mirror-lenses

https://www.khanacademy.org/science/in-in-class10th-physics/in-in-10th-physics-light-reflection-refraction/in-in-sign-conventions/v/sign-conventions-for-mirror-lenses
Sign convention for mirrors (& lenses) (video) | Khan Academy
Sign convention is a set of rules to set signs for image distance, object distance, focal length for mathematical analysis of image formation. According to it: – Object is always placed to the left of mirror. – All distances are measured from the pole of the mirror. – Distances measured in the direction of the incident ray are positive and the …

https://brilliant.org/wiki/lenses

https://brilliant.org/wiki/lenses
Lenses | Brilliant Math & Science Wiki
27 avr. 2024Heights above the principal axis are positive and those below the principal axis are negative. Distances to the right of the optical center are positive and those to the left of the optical center are negative. The focal length of a concave lens is negative and that of a convex lens is positive. The object is always placed to the left of the .
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