the image of a needle placed 10 cm from a lens is formed on a wall 20 cm on the other side of the lens. Find the focal length and size of image formed, if the size of object needle is 2.5cm
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given v =20cm u=10cm h1=2.5cm now by using lens formula 1/v-1/u=1/f 1/20+1/10=1/f 1/f=3/20 f=20/3=6.67cm. focal length =6.67cm now..... v/u=h2/h1 20/10=h2/2.5 h2=2.5*20/10 h2=5cm. so size of image is 5cm. #hope it helps #Mark as the brainliest pls
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