A bi-convex lens made of glass (refractive index 1.5) is put in a liqu – McqOptions

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1.	A bi-convex lens made of glass (refractive index 1.5) is put in a liquid of refractive index 1.7. Its focal length will [UPSEAT 2004]
A.	Decrease and change sign
B.	Increase and change sign
C.	Decrease and remain of the same sign
D.	Increase and remain of the same sign
Answer» C. Decrease and remain of the same sign

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