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1. Dictionary

   focus

   /ˈfəʊkəs/

   noun

   • 1. the centre of interest or activity: "this generation has made the environment a focus of attention" Similar centrefocal pointcentral pointcentre of attentionhubpivotnucleusheartcornerstonelinchpinkingpinbedrockbasisanchorbackbonecynosure
   • ▪ an act of concentrating interest or activity on something: "our focus on the customer's requirements" Similar emphasisaccentpriorityattentionconcentrationweightagesubjectthemeconcernsubject mattertopicissuequestiontextthesiscontentpointmotifthreadsubstanceessencegistmatter
   • ▪ the point of origin of an earthquake.
   • ▪ the principal site of an infection or other disease.
   • 2. the state or quality of having or producing clear visual definition: "his face is rather out of focus" Similar focal pointpoint of convergence
   • ▪ another term for focal point
   • ▪ the point at which an object must be situated with respect to a lens or mirror for an image of it to be well defined.
   • ▪ a device on a lens which can be adjusted to produce a clear image.
   • 3. one of the fixed points from which the distances to any point of a given curve, such as an ellipse or parabola, are connected by a linear relation.
   • 4. an element of a sentence that is given prominence by intonational or other means.

   verb

   • 1. adapt to the prevailing level of light and become able to see clearly: "try to focus on a stationary object"
   • ▪ cause (one's eyes) to focus: "she focused her eyes on his face"
   • ▪ adjust the focus of (a telescope, camera, or other instrument): "they were focusing a telescope on a star" Similar bring into focusbring to a focusaimpointturn
   • ▪ (of rays or waves) meet at a single point.
   • ▪ (of a lens) make (rays or waves) meet at a single point.
   • ▪ (of light, radio waves, or other energy) become concentrated into a sharp beam.
   • ▪ (of a lens) concentrate (light, radio waves, or energy) into a sharp beam. Similar bring into focusbring to a focusaimpointturn
   • 2. pay particular attention to: "the study will focus on a number of areas in Wales"
   • ▪ concentrate: "an opportunity to focus research on the health needs of the population" Similar concentratefixcentrepivotzero inzoom inaddress itself topay attention topinpointspotlightrevolve aroundhave as its starting point
   • 3. place the focus on (an element of a sentence).

   Word Origin mid 17th century (as a term in geometry and physics): from Latin, literally ‘domestic hearth’.

   Derivatives

   • 1. focuser noun

   Scrabble Points: 10

   • F

     4

   • O

     1

   • C

     3

   • U

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   • S

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   More definitions, origin and scrabble points

2. byjus.com › question-answer › define-the-principal-focus-of-aDefine the principle focus of a concave mirror. - BYJU'S

   byjus.com › question-answer › define-the-principal-focus-of-a

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   The principal focus of a concave mirror is a point on the principal axis at which a light ray parallel to the principal axis converges after reflection. Light rays that are parallel to the principal axis of a concave mirror converge at a specific point on its principal axis after reflecting from the mirror.

3. byjus.com › question-answer › what-is-principal-focusWhat is principal focus - BYJU'S

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   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 principal focus. The focal length of the mirror is

4. byjus.com › question-answer › define-pole-the-centre-ofDefine the pole, the center of curvature, the radius of curvature...

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   Q. (a) What is meant by (i) principal focus of a convex mirror, and (ii) focal length of a convex mirror? (b) Draw diagram to show the action of convex mirror on a beam of parallel light rays. Mark on this diagram principal axis, focus F, centre of curvature C, pole P and focal length f, of the convex mirror.

5. byjus.com › physics › concave-convex-mirrorsConcave Mirrors And Convex Mirrors - Image Formation, Ray Diagram...

   byjus.com › physics › concave-convex-mirrors

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   Similarly, for a convex mirror, the reflected ray originates from the focus on the same side as the incident ray. Focus Incidence: When a ray passes through the focus and strikes a concave or convex mirror, the reflected ray will be parallel to the principal axis. This characteristic holds for concave and convex mirrors and is crucial in ...

6. byjus.com › question-answer › define-the-principal-focus-of-aDefine the principal focus of a spherical mirror. - BYJU'S

   byjus.com › question-answer › define-the-principal-focus-of-a

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   The principal focus or focal Point of a spherical mirror is on the axis of a mirror or lens where after reflection or refraction rays of light parallel to the axis converge or begin to converge. If a bunch of rays of light is shined straight at a concave mirror, all of those beams will be mirrored by the mirror and will all meet at one point.

7. byjus.com › jee › concave-mirror-image-formationImage Formation in Concave Mirror - BYJU'S

   byjus.com › jee › concave-mirror-image-formation

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   Principal focus: The incident rays coming parallel to the principal axis after reflection appear to converge to a common point on the principal axis, and this point is called the principal focus of a concave mirror. It is usually denoted by F. Focal length: It is the distance between the pole and the principal focus of the concave mirror. It is ...

8. byjus.com › physics › convex-lensConvex Lens - Uses, Examples, Definition, Ray Diagram, Formula -...

   byjus.com › physics › convex-lens

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   These types of lenses can converge a beam of light coming from outside and focus it to a point on the other side. This point is known as the focus and the distance between the centre of the lens to the focus is called the focal length of the convex lens.

9. byjus.com › question-answer › define-the-principal-focus-of-aQuestion 1 Define the principal focus of a concave mirror. -...

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   Define focus and principal focus of a lens. Derive mirror formula for a concave mirror when image formed is (i) real (ii) virtual. Also give the sign convention used. [5 MARKS] Derive mirror formula for a concave mirror when image formed is (i) real (ii) virtual.

10. byjus.com › question-answer › define-focus-and-principal-focusDefine focus and principal focus of a lens. Derive mirror formula...

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    (c) A ray passing through the focus cuts through the principal axis of a concave mirror after reflection. (d) When an object is placed between a concave mirror and its focus, the image formed is virtual, erect and larger than the object. (e) The image formed on a cinema screen is virtual. (f) A convex mirror is used by stage artists.

11. byjus.com › biology › ecologyWhat is Ecology? - Types, Importance And Examples Of Ecology -...

    byjus.com › biology › ecology

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    Ecology is a branch of science that deals with the relationship between organisms and their interaction with the environment. Explore the types of ecology and its importance @ BYJU'S.