(B) Given: Object distance $u = -9 \, cm$,Focal length $f = 10 \, cm$.Using the lens formula: $\frac{1}{f} = \frac{1}{v} - \frac{1}{u}$.Substituting t

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(B) Given: Object distance $u = -9 \, cm$,Focal length $f = 10 \, cm$.Using the lens formula: $\frac{1}{f} = \frac{1}{v} - \frac{1}{u}$.Substituting the values: $\frac{1}{10} = \frac{1}{v} - \frac{1}{-9} \Rightarrow \frac{1}{v} = \frac{1}{10} - \frac{1}{9} = \frac{9-10}{90} = -\frac{1}{90}$.Thus,the image distance $v = -90 \, cm$.The magnification $m$ is given by $m = \frac{v}{u}$.$m = \frac{-90}{-9} = 10$.Therefore,the magnification produced by the lens is $10$.

Class 12 Physics Ray Optics and Optical Instruments Refraction by Lenses

Difficult

$A$ card sheet divided into squares each of size $1 \, mm^2$ is being viewed at a distance of $9 \, cm$ through a magnifying glass (a converging lens of focal length $10 \, cm$) held close to the eye. What is the magnification produced by the lens?

A
$5$
B
$10$
C
$15$
D
$20$

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Class 12 Questions

Class 12

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Chapter

Ray Optics and Optical Instruments

Subtopic

Refraction by Lenses

The minimum distance between an object and its real image formed by a convex lens of focal length $f$ is (in $f$)

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$A$ converging lens is used to form an image on a screen. When the upper half of the lens is covered by an opaque screen,

EasyIIT 1986

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Is power negative or positive for a concave lens?

Medium

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$A$ point object in air is in front of the curved surface of a plano-convex lens. The radius of curvature of the curved surface is $30 \; cm$ and the refractive index of the lens material is $1.5$. Then the focal length of the lens (in $cm$) is:

MediumJEE MAIN 2020

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The radii of curvature of both the surfaces of a convex lens of focal length $f$ and focal power $P$ are equal. One of the surfaces is made plane by grinding. The new focal length and focal power of the lens are:

DifficultMHT CET 2023

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$A$ card sheet divided into squares each of size $1 \, mm^2$ is being viewed at a distance of $9 \, cm$ through a magnifying glass (a converging lens of focal length $10 \, cm$) held close to the eye. What is the magnification produced by the lens?

Similar Questions

The minimum distance between an object and its real image formed by a convex lens of focal length $f$ is (in $f$)

$A$ converging lens is used to form an image on a screen. When the upper half of the lens is covered by an opaque screen,

Is power negative or positive for a concave lens?

$A$ point object in air is in front of the curved surface of a plano-convex lens. The radius of curvature of the curved surface is $30 \; cm$ and the refractive index of the lens material is $1.5$. Then the focal length of the lens (in $cm$) is:

The radii of curvature of both the surfaces of a convex lens of focal length $f$ and focal power $P$ are equal. One of the surfaces is made plane by grinding. The new focal length and focal power of the lens are:

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