Refractive Indexes Of Water A

May 14th, 2015
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OBJECTIVE: To find the refractive indexes of (a)water (b) oil using a plane mirror, an equiconvex lens, and an adjustable object needle.APPARATUS: A convex lens, a plane mirror, water, oil, clamp, stand, an optical needle, plumb line, knitting needle, half meter scale, glass slab, a spherometer.

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205130039 Refractive Indexes Of Water AOBJECTIVE:To find the refractive indexes of (a)water (b) oilusing a plane mirror, an equiconvex lens, and anadjustable object needle.APPARATUS:A convex lens, a plane mirror, water, oil, clamp,stand, an optical needle, plumb line, knittingneedle, half meter scale, glass slab, a spherometer.DIAGRAM:Fig: Focal length of glass convex les and liquid lenscombinationTHEORY:1. If f1 and f2 be the focal length of the glassconvex lens and liquid lens and f be the focallength of their combination then:or f2 ==2.Liquid lens formed a plano-concave kens with R1= R and R2 = then by using lens makes formula()=()= (n-1)=n=Where n=Refractive index of the liquidR=The radius of the curvature of theconvex lens.3.The radius of the lower surface of the convexlens is given by:R=Here, l is the average distance between the legsof the spherometer and h is the difference inthe reading of the spherometer when placedfirst on the convex lens and then on planemirror.PROCEDURE:(a) For focal length of convex lens:1.Find the rough focal length of the convexlens.2.Place a plane mirror on the horizontal baseof the iron stand and then a convex lens onthe plane mirror.3.Hold the needle in the clamp stand andadjust its position on the stand such thatthere is no parallax between tip of the needleand its image.4.Measure distance between tip and uppersurface of the lens by

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