Concave Mirror: Six Positions

Also called

concave mirror · spherical mirror · ray diagram · focus · centre of curvature · principal axis · real image · virtual image · inverted image · magnified image · mirror formula · object at infinity · object between F and C · torch reflector · dentist mirror · solar cooker · shaving mirror · अवतल दर्पण · फोकस · वक्रता केंद्र

Topics

• A concave mirror curves inwards; rays parallel to the principal axis reflect through the focus F.
• The centre of curvature C is twice as far from the mirror as F: R = 2f.
• Object at infinity: the image is a point at F, real and highly diminished.
• Object beyond C: the image forms between F and C, real, inverted and smaller.
• Object at C: the image forms at C, real, inverted and the same size.
• Object between C and F: the image forms beyond C, real, inverted and enlarged.
• Object at F: the reflected rays are parallel, so the image is at infinity, highly enlarged.
• Object between F and the pole: the image is behind the mirror, virtual, erect and enlarged.
• Concave mirrors are used in torches, vehicle headlights, shaving mirrors, dentists’ mirrors and solar cookers.

About this model

A GLB file of about 427 KB, shown in Lably's 3D viewer and, on a phone, placed in your room with AR. Credit: Model, science and animation: Lably (built procedurally with three.js; no downloaded meshes). | CC BY 4.0. Original geometry and animation made for Lably.

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