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- Dictionaryfocus/ˈfəʊkəs/
noun
- 1. the centre of interest or activity: "this generation has made the environment a focus of attention" Similar
- 2. the state or quality of having or producing clear visual definition: "his face is rather out of focus" Similar
verb
- 1. adapt to the prevailing level of light and become able to see clearly: "try to focus on a stationary object"
- 2. pay particular attention to: "the study will focus on a number of areas in Wales"
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Locus. A locus is a set of points, in geometry, which satisfies a given condition or situation for a shape or a figure. The plural of the locus is loci. The area of the loci is called the region. The word locus is derived from the word location. Before the 20th century, geometric shapes were considered as an entity or place where points can be ...
This shows that an ellipse is the locus of a point that moves in such a way that the ratio of its distance from a focus called fixed point to its distance from a directrix called fixed line equals a constant e<1. Notes: For the ellipse (x 2 /a 2)+(y 2 /b 2) = 1 ,we have: centre O (0, 0) Vertices A(a, 0) and A’(-a, 0) Major axis axis =2a and ...
Solution. Principal focus is a point (on the principal axis) where parallel incident rays meet after reflecting (in mirrors) or refracting (in lenses). It is a fixed point of particular lens/mirror and depends upon its shape. Principal Focus also determines the focal length of the lens/mirror.
Epicenter refers to the location immediately above the focus on the surface. These waves are strongest at the core and weaken as they go away. The most severe earthquake damage will occur close to the epicenter. Hence, the strongest trembling occurs during an earthquake at the epicenter. Therefore, the focus of an earthquake is the epicenter.
Organismal ecology is the study of an individual organism’s behaviour, morphology, physiology, etc. in response to environmental challenges. It looks at how individual organisms interact with biotic and abiotic components. Ecologists research how organisms are adapted to these non-living and living components of their surroundings.
What is principal focus for concave lens? Name the spherical mirror which has : (a) virtual principal focus. (b) real principal focus. Q. An object is placed beyond the principal focus at a distance of 9 cm from it in front of a concave mirror on the principal axis. The image is formed beyond the principal focus at a distance of 16 cm from the ...
Which is the required hyperbola. Example 2: Find the eccentricity of the hyperbola whose latus rectum is half of its transverse axis. Solution: Let the equation of hyperbola be [ (x 2 / a 2) – (y 2 / b 2)] = 1. Then transverse axis = 2a and latus – rectum = (2b 2 / a) According to question (2b 2 / a) = (1/2) × 2a.
Eccentric Meaning in Geometry. The eccentric meaning in geometry represents the distance from any point on the conic section to the focus divided by the perpendicular distance from that point to the nearest directrix. Generally, the eccentricity helps to determine the curvature of the shape. If the curvature decreases, the eccentricity increases.
The normal to a parabola can be represented in various ways. The equation of the normal at a point (x 1, y 1) is given by (y – y 1) = (- y 1 / 2a) (x – x 1). Properties of normal to the parabola y2 = 4ax are discussed below. Three normals can be constructed from a given point to the parabola y 2 = 4ax. The algebraic sum of the slope of the ...
Convex Lenses. When an object is placed at infinity, the real image is formed at the focus. The size of the image is highly diminished and point size. When an object is placed beyond the centre of curvature, the real image is formed between the centre of curvature and focus. The image size will not be the same as the object.
