^Myopia versus Hypermetropia
^Myopia versus Hypermetropia
Entries by kp-web-admin
^Persistence of eye
^Persistence of eye Image of an object remains or persists for 0.1 s even after the object has vanished. This time is called persistence of eye. Now if two objects are shown to eye at a time gap of less than 0.1 s, eye fails to distinguish them separately. This effect is called stroboscopic effect. […]
^Sensitivity of human eye
^Sensitivity of human eye The following graph shows the variation of sensitivity of human eye with the wavelength of light. From the above graph it is clear that the sensitivity of human eye is low for both red & violet colour wavelengths. It is maximum for 555 nm wavelength which corresponds to yellow – green […]
^Human eye
^Human eye Eyes ball: 1 inch diameter Cornea: Front bulged transparent, causes most of the refraction. Eye lens: Crystalline lens hard at the middle but becomes soft towards the corners & has a average refractive index of about 1.4 Pupil: Adjustable aperture that control the amount of light entering the eye. Its size is adjusted […]
^Astronomical telescope
^Astronomical telescope Far point case (i.e. ve → ∞), eye is least strained. (a) (b) L = fo + fe = maximum (as ue = fe, when ve → ∞
^Compound microscope
^Compound microscope Far point case (i.e. ve → ∞), eye is least strained. The magnifying power for normal setting remains unchanged on interchanging the field & eye lens. (b) L = vo + fe [As ue = fe (when ve → ∞ Near point case (i.e. ve = D), strain is maximum (b) L […]
^Near point case
^Near point case It the object is placed between F & P of a convex lens such that the images at near point (25 cm) is formed as shown, then the magnifying power of lens is Magnifying power of a simple microscope can be increased by decreasing the focal length of the lens, however generally […]
^Simple microscope
^Simple microscope A simple microscope is simply a converging lens of small focal length (f < D). Suppose a short object has a height h0 is viewed by eye without using a lens by pacing it at near point, then the visual angle made by the object eye is Far point case It the object […]
^Spherical Aberration
^Spherical Aberration Due to curvature of a lens marginal rays meet at a point situated at a nearer distance from lens & paraxial rays undergo minimum & meet at a point situated at greater distance for optical center of the lens resulting in a large no. of blurred images. It can never be eliminated but […]
^Chromatic aberration
^Chromatic aberration (a) Various colors in white light get dispersed at various points on the principal axis resulting in a large no. of blurred images. (b) Longitudinal chromatic abb. = fR – fV =df = – ωf (c) For a combination of two lenses separated by a distance x to produce achromatism. If lenses are […]
About us
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.
Courses We Offer
Contact Details
Copyright © 2021 KP Institute of Physics | Powered by RiAcub
