Question

The power of plane glass is (A) $\infty$ (B) 0 (C) $\overline{2 \mathrm{D}}$ (D) $4 \mathrm{D}$

   The power of plane glass is
(A) $\infty$
(B) 0
(C) $\overline{2 \mathrm{D}}$
(D) $4 \mathrm{D}$

JEE Physics

StemEZ 1st Edition

Chapter 16, Problem 2223

Instant Answer

Solved by Expert Ishu Khandelwal

10/28/2021

Step 1

Step 1: The power of a lens is given by the formula P = 1/f, where f is the focal length of the lens. Show more…

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The power of plane glass is (A) $\infty$ (B) 0 (C) $\overline{2 \mathrm{D}}$ (D) $4 \mathrm{D}$

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Key Concepts

Lens Power

Lens power quantifies the ability of a lens to converge or diverge light, and is measured in diopters as the reciprocal of the focal length. A lens with a finite focal length has a non-zero power, while a lens that does not converge or diverge light has zero power.

Focal Length

The focal length is the distance from the lens at which parallel rays of light either converge to a point or appear to diverge from a point. In cases where the focal length is infinite, as with a plane parallel surface, the lens does not change the direction of light rays and its power is effectively zero.

Plane Parallel Glass

Plane parallel glass refers to a flat glass slab with two parallel surfaces. Because the surfaces do not bend light, a plane parallel glass does not converge or diverge light beams, resulting in an infinite focal length and, hence, a lens power of zero.

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