{"id":3549,"date":"2023-10-05T11:28:15","date_gmt":"2023-10-05T11:28:15","guid":{"rendered":"http:\/\/localhost\/ecole9ja\/?p=3549"},"modified":"2023-10-05T11:32:41","modified_gmt":"2023-10-05T11:32:41","slug":"week-3-ss2-third-term-physics-notes","status":"publish","type":"post","link":"https:\/\/ecolebooks.com\/nigeria\/posts\/week-3-ss2-third-term-physics-notes\/","title":{"rendered":"Week 3 &#8211; SS2 Third Term Physics Notes"},"content":{"rendered":"<p><strong>WEEK THREE<br \/>\n<\/strong><strong>REFRACTION OF LIGHT<br \/>\n<\/strong><\/p>\n<ul>\n<li>\n<div>Laws of refraction,\n<\/div>\n<\/li>\n<li>\n<div>Effects of refraction,\n<\/div>\n<\/li>\n<li>\n<div>Refraction through rectangular prism.\n<\/div>\n<\/li>\n<\/ul>\n<p>\u00a0<strong>REFRACTION<br \/>\n<\/strong>There is a change in the direction and speed of a ray of light when it passes from medium to another medium of different density.  This change in the direction of the light of the light ray which is due to difference in the speed of light in different media is called refraction.<br \/>\nWhen a ray of light travels from optically less dense medium (air) to an optically dense medium (water, glass), it bends towards the normal.<br \/>\nA ray passing from glass or water to air is bent away from the normal<br \/>\nWhen a wave, e.g light wave is refracted, <\/p>\n<ol>\n<li>\n<div>Its direction of travel changes\n<\/div>\n<\/li>\n<li>\n<div>Its velocity changes.\n<\/div>\n<\/li>\n<li>\n<div>Its wavelength changes\n<\/div>\n<\/li>\n<li>\n<div>Its frequency remains the same.\n<\/div>\n<\/li>\n<\/ol>\n<p>\u00a0<img decoding=\"async\" src=\"https:\/\/ecolebooks.com\/nigeria\/wp-content\/uploads\/9jalessonsimages\/100523_1128_Week3SS2Th1.png\" alt=\"\"\/><strong><br \/>\n\t\t\t<\/strong><br \/>\n\u00a0<strong>REFRACTION THROUGH RECTANGULAR PRISM<br \/>\n<\/strong><strong>LAWS OF REFRACTION<br \/>\n<\/strong>1.\u00a0\u00a0\u00a0\u00a0The incident and refracted ray are in opposite sides of the normal at the point of incidence, all the three are in the same plane.<br \/>\n2.\u00a0\u00a0\u00a0\u00a0The ratio of the sine of the angle of incidence to the sine of the angle of refraction is a constant for a given pair of media.<br \/>\nThe second law is known as Snell&#8217;s law<\/p>\n<p>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<img decoding=\"async\" src=\"https:\/\/ecolebooks.com\/nigeria\/wp-content\/uploads\/9jalessonsimages\/100523_1128_Week3SS2Th2.png\" alt=\"\"\/><br \/>\n\t\tThe constant n, is known as the refractive index of the second medium with respect to the first medium.  It is a number which gives a measure of refraction or bending of light as it travels from one medium to another.<br \/>\n<img decoding=\"async\" align=\"left\" src=\"https:\/\/ecolebooks.com\/nigeria\/wp-content\/uploads\/9jalessonsimages\/100523_1128_Week3SS2Th3.png\" alt=\"\"\/><br \/>\n\t\t\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0Sine of angle of incidence in air<br \/>\n<img decoding=\"async\" align=\"left\" src=\"https:\/\/ecolebooks.com\/nigeria\/wp-content\/uploads\/9jalessonsimages\/100523_1128_Week3SS2Th4.png\" alt=\"\"\/>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0Sine of angle of refraction in glass<\/p>\n<p>\u00a0<img decoding=\"async\" align=\"left\" src=\"https:\/\/ecolebooks.com\/nigeria\/wp-content\/uploads\/9jalessonsimages\/100523_1128_Week3SS2Th5.png\" alt=\"\"\/><br \/>\n\t\t\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0Sine of angle of incidence in glass<br \/>\n<img decoding=\"async\" align=\"left\" src=\"https:\/\/ecolebooks.com\/nigeria\/wp-content\/uploads\/9jalessonsimages\/100523_1128_Week3SS2Th6.png\" alt=\"\"\/>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0Sine of angle of refraction in air<\/p>\n<p>\u00a0From the principle of reversibility of light<br \/>\n\u00a0\u00a0\u00a0\u00a0<img decoding=\"async\" src=\"https:\/\/ecolebooks.com\/nigeria\/wp-content\/uploads\/9jalessonsimages\/100523_1128_Week3SS2Th7.png\" alt=\"\"\/><br \/>\n\t\t<img decoding=\"async\" align=\"left\" src=\"https:\/\/ecolebooks.com\/nigeria\/wp-content\/uploads\/9jalessonsimages\/100523_1128_Week3SS2Th8.png\" alt=\"\"\/>Furthermore    speed of light in glass<br \/>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0Speed of light in air <img decoding=\"async\" align=\"left\" src=\"https:\/\/ecolebooks.com\/nigeria\/wp-content\/uploads\/9jalessonsimages\/100523_1128_Week3SS2Th9.png\" alt=\"\"\/>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/p>\n<p>\u00a0<strong>EFFECTS OF REFRACTION<br \/>\n<\/strong>The phenomenon of refraction is responsible for the following<br \/>\n1 The bottom of a clear river or pond appears shallower than it really is<br \/>\n2 A rod or spoon appears bent or broken when it is partially immersed in water or any liquid<br \/>\n3 Letters in print seem to be nearer when we place a thick block of glass over them.      <\/p>\n<p>\u00a0<strong>General Revision<br \/>\n<\/strong><\/p>\n<ol>\n<li>\n<div>The magnitude of the resultant of two mutually perpendicular forces F<sub>1<\/sub> and F<sub>2<\/sub> is 13N. If the magnitude of F<sub>1<\/sub> is 5N what is the magnitude of F<sub>2<\/sub>? (a)16.0N  (b) 12.0N\n<\/div>\n<\/li>\n<\/ol>\n<p>\u00a0<\/p>\n<ol>\n<li>\n<div>Two 10N forces are inclined at an angle of 30<sup>0<\/sup> to each other the magnitude of the resultant force is?\n<\/div>\n<\/li>\n<\/ol>\n<p>\u00a0<strong>Reading Assignment:<\/strong> New School Physics Pages 290 &#8211; 292  <\/p>\n<p>\u00a0<strong>WEEKEND ASSIGNMENT<br \/>\n<\/strong>1 The direction of a light ray changes as it passes from one medium to another. This \u00a0\u00a0\u00a0\u00a0phenomenon is called A diffraction B reflection C dispersion D refraction<br \/>\n2 \u00a0\u00a0The velocities of light in air and glass are 3.0 x10<sup>8<\/sup> m\/s and 1.8 x10<sup>8<\/sup> m\/s respectively. Calculate \u00a0\u00a0\u00a0\u00a0the sine of the angle of incidence that will produce an angle of refraction of 30<sup>0<\/sup> for a ray of \u00a0\u00a0\u00a0\u00a0light incident on glass A. 1.2 \u00a0\u00a0\u00a0\u00a0B.  1.0 \u00a0\u00a0\u00a0\u00a0C . 0.8\u00a0\u00a0\u00a0\u00a0 D.  0.6<br \/>\n3\u00a0\u00a0 A transparent rectangular block 5.0 cm thick is placed on a black dot. The dot when viewed \u00a0\u00a0\u00a0\u00a0\u00a0from above is seen 3.0 cm from the top of the block. Calculate the refractive index of the \u00a0\u00a0\u00a0\u00a0material of the block A.  2\/5 \u00a0\u00a0\u00a0\u00a0B.  3\/5 \u00a0\u00a0\u00a0\u00a0C. 3\/2\u00a0\u00a0\u00a0\u00a0D. 5\/3 E.  5\/2<br \/>\n4 \u00a0\u00a0When a ray of sunlight passes obliquely through a rectangular glass block<br \/>\n\u00a0\u00a0\u00a0\u00a0\u00a0A.  it emerges without displacement parallel to the incident ray<br \/>\n\u00a0\u00a0\u00a0\u00a0\u00a0B. it gets dispersed into seven visible colours without any deviation at all<br \/>\n\u00a0\u00a0\u00a0\u00a0\u00a0C. it deviates without dispersion<br \/>\n\u00a0\u00a0\u00a0\u00a0\u00a0D. it gets laterally displaced and the emergent ray is parallel to the incident ray<br \/>\n5\u00a0\u00a0 The absolute refractive indexes of glass and water are 3\/2 and 4\/3 respectively. The \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0refractive at the interface when a ray travels from water to glass is A \u00bd B 8\/9 C 9\/8 D17\/12<\/p>\n<p>\u00a0<strong>THEORY<br \/>\n<\/strong>1 A ray of light passes from air  through a rectangular block of glass with parallel side 4.5 cm apart at an angle of incidence of 52<sup>0<\/sup>,find<br \/>\n(a) The lateral displacement of the ray (b) The angle of refraction (Refractive index of glass=1.5)<br \/>\n2  Radio wave travels on air at 3.0X10<sup>8<\/sup>m\/s. if the waves enter water of refractive index of 4\/3 , calculate the speed of the radio waves in water.<\/p>\n<p>\u00a0<br \/>\n\t\t\u00a0<\/p>\n","protected":false},"excerpt":{"rendered":"<p>WEEK THREE REFRACTION OF LIGHT Laws of refraction, Effects of refraction, Refraction through rectangular prism&#8230;.<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1,279],"tags":[],"class_list":["post-3549","post","type-post","status-publish","format-standard","hentry","category-posts","category-third-term-ss2-physics"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/ecolebooks.com\/nigeria\/wp-json\/wp\/v2\/posts\/3549","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ecolebooks.com\/nigeria\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ecolebooks.com\/nigeria\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ecolebooks.com\/nigeria\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/ecolebooks.com\/nigeria\/wp-json\/wp\/v2\/comments?post=3549"}],"version-history":[{"count":1,"href":"https:\/\/ecolebooks.com\/nigeria\/wp-json\/wp\/v2\/posts\/3549\/revisions"}],"predecessor-version":[{"id":3550,"href":"https:\/\/ecolebooks.com\/nigeria\/wp-json\/wp\/v2\/posts\/3549\/revisions\/3550"}],"wp:attachment":[{"href":"https:\/\/ecolebooks.com\/nigeria\/wp-json\/wp\/v2\/media?parent=3549"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ecolebooks.com\/nigeria\/wp-json\/wp\/v2\/categories?post=3549"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ecolebooks.com\/nigeria\/wp-json\/wp\/v2\/tags?post=3549"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}