SATHEE: Optics Question 692

Optics Question 692

Question: Two lenses of power + 12 and -2 diopters are placed in contact. The combined focal length of the combination will be

[Pb. PET 2004]

Options:

A) 8.33 cm

B) 1.66 cm

C) 12.5 cm

D) 10 cm

Show Answer

Answer:

Correct Answer: D

Solution:

$P = P_{1} + P_{2}$

$= + 12 - 2 = 10 D$ Now $F = \frac{1}{P} = \frac{1}{10} m$

$= \frac{1}{4} + \frac{1}{- 5} = \frac{1}{20}$ .

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Optics Question 692

Question: Two lenses of power + 12 and -2 diopters are placed in contact. The combined focal length of the combination will be

Options:

Answer:

Solution:

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