Focal length or power of a lens immersed in a liquid

1. A.
   2.5 D
2. B.
   −2.5 D
3. C.
   1.25 D
4. D.
   −1.25 D

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1. A.
   2:3
2. B.
   2:5
3. C.
   3:2
4. D.
   5:2

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1. A.
   concave lens of focal length (3.5)R
2. B.
   concave lens of focal length $2R$
3. C.
   convex lens of focal length (3.5)R
4. D.
   convex lens of focal length $2R$

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1. A.
   $2:3$
2. B.
   $3:2$
3. C.
   $2:5$
4. D.
   $5:2$

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1. A.
   $655$ mm
2. B.
   $288$ mm
3. C.
   $555$ mm
4. D.
   $355$ mm

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1. A.
   $\dfrac{(\mu_0 - \mu)f}{\mu(\mu_0 - 1)}$
2. B.
   $\dfrac{\mu(\mu_0 - 1)f}{(\mu_0 - \mu)}$
3. C.
   $\dfrac{(\mu - \mu_0)f}{\mu_0(\mu - 1)}$
4. D.
   $\dfrac{\mu_0(\mu - 1)f}{(\mu - \mu_0)}$

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1. A.
   $2 : 3$
2. B.
   $2 : 5$
3. C.
   $3 : 4$
4. D.
   $5 : 2$

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