Two convex lenses of power 2 D and 5 D are separated by a distance 1 3 m . The power of the optical system formed is

Given P 1 = 2 D P 2 = 3 D d = 1 3 m We know that 1 F = 1 f 1 + 1 f 2 - d f 1 . f 2 ∴ P = P 1 + P 2 - d P 1 . P 2 = 2 + 3 - 1 3 × 2 × 3 ⇒ P = 3 D

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Physics - Geometrical Optics Question with Solution | TestHub

PhysicsGeometrical OpticsRefraction at curved surface/LensEasy2 minPYQ_2020

PhysicsEasysingle choice

Two convex lenses of power $2 D$ and $5 D$ are separated by a distance $\frac{1}{3} m$ . The power of the optical system formed is

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Answer:

Solution:

Given

$P_{1} = 2 D$

$P_{2} = 3 D$

$d = \frac{1}{3} m$

We know that

$\frac{1}{F} = \frac{1}{f_{1}} + \frac{1}{f_{2}} - \frac{d}{f_{1} . f_{2}}$

$∴ P = P_{1} + P_{2} - d P_{1} . P_{2}$

$= 2 + 3 - \frac{1}{3} \times 2 \times 3$

$\Rightarrow P = 3 D$

Stream:NTA_ABHYAS_NEETSubject:PhysicsTopic:Geometrical OpticsSubtopic:Refraction at curved surface/Lens

⏱ 2mℹ️ Source: PYQ_2020

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