First slide

The lens

Question

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

Moderate

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

Solution

$\frac{f_{l}}{f_{a}} = \frac{{aμ}_{g} - 1}{u_{g} - 1} = \frac{(1 .5 - 1) \times 1 .7}{(1 .5 - 1 .7)} \Rightarrow f_{l} = \frac{0 .85}{- 0 .2} f_{a} = - 4 .25 f_{a}$

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