SATHEE: Optics Question 688

Optics Question 688

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

[UPSEAT 2004]

Options:

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

Show Answer

Answer:

Correct Answer: B

Solution:

$\frac{f_{l}}{f_{a}} = \frac{_{a} μ_{g} - 1}{_{l} μ_{g} - 1} = \frac{(1.5 - 1) \times 1.7}{(1.5 - 1.7)}$

$\Rightarrow f_{l} = \frac{0.85}{- 0.2}$

$f_{a} = - 4.25 f_{a}$ .

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Optics Question 688

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

Options:

Answer:

Solution:

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