^Real object 1. A position from which incident rays diverge 2. situated infront of mirror i.e. towards the reflecting side 3. u = – ve for both lenses & mirror 4. Unless mention assume object to be real, transverse, producing paraxial rays.
^Convex mirror & Concave lens A convex mirror has Inner or depressed side polished. A concave lens is thick near edges & thin near the center. They have following common features Virtual focus Diverge light rays striking on them Negative optical power Can form only a diminished & virtual image of a real object.
^Concave mirror & Convex lens A concave mirror has outer or bulged side polished. A convex lens is thick near center & thin near the edges. They have following common features Real focus Converge light rays striking on them Positive optical power Can form several type of images such as diminished, enlarged, same size, real […]
^Plane mirror 1. Image formed by a plane mirror is virtual, erect, undiminished, unmagnified, behind the mirror such that both the object & image are at equal distances from the mirror. 2. A plane mirror forms real image for a virtual object.
^Spherical aberration The various rays in a wide beam falling on a concave mirror of large aperture after reflection don’t meet at a single focus, marginal rays get focused somewhere between F & F while paraxial between C & F , consequently the image formed is not bright & single but a large no. of […]
^Paraxial & marginal rays In a wide beam of incident rays the rays travelling close to principal axis are called paraxial & the rays away from principal axis are called marginal.
^Law of reflection The Incident ray, Reflected ray & normal to the reflecting surface at the point of incidence all are coplanar i.e. lie in the same plane Angle of incidence = Angle of reflection Maximum value of angle of incidence & angle of reflection is 900 & minimum is 00. Normal lies between Incident […]
^Reflection of light Most of the light on striking a denser boundary comes back in same medium. There is a phase change of π if reflection takes place from a denser medium. Frequency, wavelength & speed of the light all remains the same. Intensity and hence, amplitude (I ∝ A2) usually ↓ es due to […]
^Visible light Visible light is a mixture of photons λ = 380 nm (violet) to 780 nm (violet) in appropriate proportion. Colour of light is determined by its frequency & not wavelength.
^Energy of a photon Energy ‘E’ of a photon depends upon its frequency ‘f’ or wavelength ‘λ’ & is described by Max Planck quantum radian law [called energy condition Energy of visible light is greater than that of infra red but smaller than ultraviolet. Red colour photons have maximum wavelength thus are least energetic. Also […]
Our objective is to create a situation where students will find Physics interesting & the strongest subject helping them to achieve top ranks in competitive exams.
Copyright © 2021 KP Institute of Physics | Powered by RiAcub
Call 9872662552