A turnip sits before a thin converging lens,o | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(A) The lens formula is given by $\frac{1}{f} = \frac{1}{v} - \frac{1}{u}$,where $u$ is the object distance (negative),$v$ is the image distance,and $

Vedclass · Accepted Answer

decrease the squeeze of the lens

Vedclass · Answer

(A) The lens formula is given by $\frac{1}{f} = \frac{1}{v} - \frac{1}{u}$,where $u$ is the object distance (negative),$v$ is the image distance,and $f$ is the focal length.As the turnip (object) moves away from the lens,the magnitude of $u$ increases.For a fixed image distance $v$ (since the card position is fixed),the term $\frac{1}{v}$ remains constant.As $|u|$ increases,$\frac{1}{|u|}$ decreases.To maintain the equality $\frac{1}{f} = \frac{1}{v} - \frac{1}{|u|}$,as $\frac{1}{|u|}$ decreases,$\frac{1}{f}$ must decrease,which means the focal length $f$ must increase.Increasing the focal length $f$ of a lens requires decreasing its curvature.Since squeezing the lens increases its curvature (making it more convex and decreasing $f$),to increase $f$,we must decrease the squeeze of the lens.

Similar Questions

$A$ lens is placed between a source of light and a wall. It forms images of area $A_1$ and $A_2$ on the wall for its two different positions. The area of the source of light is

An object is placed at a distance of $20 \ cm$ from a convex lens of focal length $10 \ cm$. The image is formed on the other side of the lens at a distance of . . . . . . $cm$.

$A$ plano-concave lens is made of glass of refractive index $1.5$ and the radius of curvature of its curved face is $100 \,cm$. What is the power of the lens?

The optical power of a thin glass lens (refractive index $1.5$) in air is $-5 \ D$. What will be its optical power in a liquid with a refractive index of $1.6$ (in $D$)?

$A$ bi-convex lens made of glass (refractive index $1.5$) is put in a liquid of refractive index $1.7$. Its focal length will

Vedclass Test Series

Exam Paper Generator

Online Exam Module