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It assesses knowledge in subjects relevant to the candidate’s chosen course of study.","tags","utme jamb joint admission matriculation board unified tertiary matriculation examination nigeria africa","version","vip","location",{"_390":391,"_392":393},"type","Point","coordinates",[394,395],9.082,10.3671,"ng","priority",5,"createdOn",1755987353430,"updatedOn","questionsCount",29915,"courseCount",20,"examKey","questionData",{"_369":409,"_410":411,"_412":413,"_278":415,"_416":417,"_263":370,"_418":419,"_420":421,"_110":426},"FbcYGg3dv0AnIwS2Uf3dx9nucPfcqS","q","The distance between an object and its real image in a convex lens is 40cm. If the magnification of the image is 3, calculate the focal length of the lens","ans",[414],1,"2019","course","physics","exp","

u + v = 40

\n\n

\\(\\frac{v}{u}\\) = 3

\n\n

v = 3u

\n\n

u + 3u = 40

\n\n

4u = 40

\n\n

u = 10cm

\n\n

v = 3u = 30cm

\n\n

f = \\(\\frac{uv}{u + v} = \\frac{10(30)}{10 + 30} = \\frac{300}{40}\\)

\n\n

= 7.5 cm

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JAMB - Physics (2019 - No. 16)

Explanation

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