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Using mirror formula how will you prove that when an object is placed between focus and center of curvature it forms its image between center of curvature and infinity

Posted by Zaid Sadri 5 years, 6 months ago

CBSE > Class 10 > Science

1 answers

Study Lover ?‍? ?‍? 5 years, 6 months ago

If we prove that image distance (v) is greater than centre of curvature,then the image lies between infinity and centre of curvature. To prove=v>2a Let the focus be a Centre of curvature=2f=2a Object distance=u Image distance=v Magnification=h'/h=-v/u We know that image become enlarged when it is kept between focus and curvature. Magnification>1----------------(1) From mirror formula, 1/f=1/v+1/u -1/a=-1/v+(-1/u)(v,u and f are negative according to convention rules) 1/a=1/v+1/u 1/a=u+v/vu vu=av+au v=av+au/u v=a(v/u+1) v>a(1+1) {using (1)} v>2a Hence,image of object lies between infinity and centre of curvature.

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Posted by Pandey Ji 5 months, 3 weeks ago

CBSE > Class 10 > Science