Physics Light and Optics Welcome to your Physics Light and Optics Name Email ‘Myopia’ is also known as: (a) near-sightedness (b) astigmatism (c) presbyopia (d) far-sightedness None What is the full form of LED? (a) Linear Emergency Device (b) Light Emitting Diode (c) Liquid Emitting Display (d) Light Emitting Device None An image formed on a screen is called a ______ image, whereas the image formed by a plane mirror is called a ______ image. (a) real; virtual (b) parabolic; perpetual (c) virtual; real (d) vector; layered None The colour of the clear sky is blue due to the phenomenon of: (a) dispersion of light (b) reflection of light (c) scattering of light (d) refraction of light None People who wear bifocal lenses have ______. (a) hypermetropia (b) myopia (c) presbyopia (d) cataract None Which of the following types of mirrors show a lateral inversion of light? (a) Convex mirror (b) Concave mirror (c) Rectangle mirror (d) Plane mirror None Which of the following mirror is used in vehicles as a headlight? (a) Double Convex mirror (b) Plane mirror (c) Concave mirror (d) Convex mirro None Apart from the red and green wavelengths of sunlight, which other wavelength of sunlight is absorbed by water molecules in the ocean? (a) Orange (b) Blue (c) Violet (d) Yell None The absolute refractive index of ______ is 2 (a) air (b) diamond (c) crown (d) water None How many colours does sunlight consist of? (a) Three (b) Two (c) Seven (d) Five None Which phenomenon deals with the scattering of light by molecules of a medium when they are excited to vibrational energy levels? (a) Huygens Effect (b) Maxwell Effect (c) Raman Effect (d) Rayleigh Effect None The phenomenon of deviation of light rays from their original they pass from one medium to another, is called ____ (a) obstruction (b) reflection (c) Diffraction (d) Refractio None Which among the following has its refractive index closest to that of crown glass ? (a)Canada balsam (b)Sapphire (c)Diamon (d)Ruby None The total number of images formed by two mirrors inclined at 120° to each other is ______ (a) 1 (b) 2 (c) 4 (d) 3 None What is the colour of the light emitted by the Sun ? (a) Yellow (b) Orange (c) Red (d) White None What is the name of the phenomena (derived by scattering of the light) in which mountain tops acquire a rosy or orange hue around sunrise and sunset ? (a) Brillouin scattering (b) Circle of confusion (c) Alpenglow (d) Barrel distortion None The part of the eye which is responsible for the conversion of image of an object into neural signals is: (a) iris (b) optic nerve (c) vitreous humour (d) retina None Image formed by a Plane Mirror is always ______. (a) Virtual and Erect (b) Real and Erect (c) Real and Inverted (d) Virtual and Inverted None mirror used by dentists to see large images of teeth of patients is ______. (a) ZigZag Mirror (b) Plane Mirror (c) Convex Mirror (d) Concave Mirror None Which of the following is the instrument used in submarines to view objects above sea level ? (a) Odometer (b) Pyrheliometer (c) Hypsometer (d) Periscope None Twinkling of stars is mainly due to which phenomenon ? (a) Diffraction (b) Refraction (c) Reflection (d) Advection None What will be the size of the image formed by a concave mirror when an object placed between Pole and Focus? (a) Same Size (b) Enlarged (c) Point Size (d) Diminishedq None Fulminology is the study of: (a) Volcanic eruptions (b) Lightening (c) Natural gases (d) Atmosphere None The sky appears blue due to: (a) Refraction of light (b) Dispersion of light (c) Scattering of light (d) Reflection of light None The Tyndall Effect is due to: (a) Scattering of Light (b) Dispersion of LIght (c) Refraction of Light (d) Reflection of Light None The lens-type commonly used for correcting presbyopia is ______. (a) bifocal lens (b) cylindrical lens (c) convex lens (d) concave lens None Rajat has hypermetropia. What type of lens will the ophthalmologist recommend to correct his vision? (a) Bifocal (b) Concave (c) Progressive (d) Convex None Which instrument is used to measure the intensity of light produced by an unknown source in terms of a standard source? (a) Photometer (b) Calipers (c) Ammeter (d) Dynamometer None The amount of light entering into eye can be controlled and regulated by (a) iris (b) cornea (c) pupil (d) retina None Time's up
