Concave & Convex Mirror & Lens: Identify, Mnemonics, Applications & Use YouTube Lecture Handouts

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Concave & Convex Mirror & Lens: Identify, Mnemonics, Applications & Uses | Olympiad | Physics

Title: Convex & Concave Mirror & Lens How to Remember?

Concave Mirror
  • Concave mirror is converging – inner side is reflecting – Centre of curvature (C) and principal focus (P) are real – solar cooker, dentist, torch, microscope and telescope and shaving mirrors – can be inverted, real, virtual or erect; also, size can be small, large or same – depending on the position of the object.
  • Convex is diverging – outer side is reflecting - Centre of curvature (C) and principal focus (P) are virtual – side mirrors of vehicles (as image is always erect and have wider field of view) , corner of streets to avoid vehicle collision – virtual, upright and reduced image
Concave Mirror
  • Lens is transparent glass bound by spherical surface
  • Convex or converging lens – used in microscope (A microscope can be made from two convex lenses. The image formed by the first element becomes the object for the second element. The second element forms its own image, which is the object for the third element, and so on) and telescope and correct eye defects like hypermetropia or long sightedness
  • Concave lens or diverging lens is used to correct eye defect like myopia or short sightedness – image is formed on same side and is virtual and erect – size of image is smaller than object

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