SATHEE: Optics Question 663

Optics Question 663

Question: If two + 5 D lenses are mounted at some distance apart, the equivalent power will always be negative if the distance is

[UPSEAT 2002]

Options:

A) Greater than 40 cm

B) Equal to 40 cm

C) Equal to 10 cm

D) Less than 10 cm

Show Answer

Answer:

Correct Answer: A

Solution:

$P = P_{1} + P_{2} - d P_{1} P_{2} \Rightarrow P = 10 - 25 d$

$\Rightarrow$ For $P$ to be negative $25 d > 10$

$\Rightarrow$ $d > 0.4 m$ or $d > 40$ cm

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Optics Question 663

Question: If two + 5 D lenses are mounted at some distance apart, the equivalent power will always be negative if the distance is

Options:

Answer:

Solution:

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