A convex lens is dipped in a liquid whose refractive index is equal to the refractive of the lens. Then its focal length willA. Become zeroB. Become infiniteC. Become small, but non-zeroD. Remain unchanged

A convex lens is dipped in a liquid whose refractive index is equal to

1.	A convex lens is dipped in a liquid whose refractive index is equal to the refractive of the lens. Then its focal length willA. Become zeroB. Become infiniteC. Become small, but non-zeroD. Remain unchanged
Answer» Correct Answer - B use `1/f=(mu-1)(1//R_1-1//R_2)`, Here `mu-(mu_"convex lens")/(mu_"liquid")=1 therefore f=oo`

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A convex lens is dipped in a liquid whose refractive index is equal to the refractive of the lens. Then its focal length willA. Become zeroB. Become infiniteC. Become small, but non-zeroD. Remain unchanged

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