A convex lens forms a real inverted image of a needle at a distance of 50cm from it where needle place if the size of the image is equal the objective calculate power and focal lenght of lens
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size of obect is equal to image size , it means the object is at C ( centre of curvature)
F=C/2
= 50/2 = 25cm
focal length=25 cm
F=C/2
= 50/2 = 25cm
focal length=25 cm
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