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A convex lens is dipped in a liquid, whose refractive index is equal to the refractive index of the lens.

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A convex lens is dipped in a liquid, whose refractive index is equal to the refractive index of the lens. Then, its focal length will 

(a) become zero 

(b) becomes infinite 

(e) remain unchanged 

(d) become small, but non-zero

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(b) becomes infinite

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