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When an object is placed 60cmin front of diverging lens a virtual image is formed 20cm from the lens .The lens is made of material of refractive index =1.65 and the its two spherical surface have the radius of curvature .What is the value of this radius

When an object is placed 60cmin front of diverging lens a virtual image is formed 20cm from the lens .The lens is made of material of refractive index =1.65 and the its two spherical surface have the radius of curvature .What is the value of this radius

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