a convex lens made up of glass of refractive index 1.5 is dipped in turn
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in case one lens is dipped in denser medium hence it will behave like converging .focal length decrease
in case 2 lense is in rarer medium hence it will behave like diverging.focal length increase
in case 2 lense is in rarer medium hence it will behave like diverging.focal length increase
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Explanation:
If focal length obtained from Lens Maker Formula is negative then focal length decreases a lens is diverging.
If focal length obtained from Lens Maker Formula is positive then focal length increases a lens is converging.
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