A thin double-concave lens is made of a very | vedclass

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

Question

(D) double-concave lens acts as a converging lens if its effective refractive index $n_{lens}$ is greater than the refractive index of the surrounding

Vedclass · Accepted Answer

$L_2$ and immersed in $L_1$

Vedclass · Answer

(D) double-concave lens acts as a converging lens if its effective refractive index $n_{lens}$ is greater than the refractive index of the surrounding medium $n_{medium}$.For a lens filled with a medium of refractive index $n_{in}$ and placed in a medium of refractive index $n_{out}$, the lens behaves as a converging lens if $n_{in} > n_{out}$.Given that the lens is double-concave, it normally diverges light. To make it converge light, the refractive index of the material inside the lens must be greater than the refractive index of the surrounding medium.Therefore, if the lens is filled with $L_2$ (refractive index $n_2$) and immersed in $L_1$ (refractive index $n_1$), it will act as a converging lens if $n_2 > n_1$.

$A$ thin double-concave lens is made of a very thin transparent material. It can be filled with air or two liquids $L_1$ and $L_2$ having refractive indices $n_1$ and $n_2$ respectively. The lens will converge a parallel beam of light if it is filled with ........

Similar Questions

The graph between the lateral magnification $(m)$ produced by a lens and the distance of the image $(v)$ is given by

The graph shows how the magnification $m$ produced by a thin lens varies with image distance $v$. What is the focal length of the lens used?

When the object is at distances $u_1$ and $u_2$ from a lens,the images formed are real and virtual respectively,and both have the same size. Then the focal length of the lens is:

$A$ thin lens made of glass of refractive index $\mu_g = 1.5$ has a focal length of $12 \ cm$ in air. If it is immersed in water of refractive index $\mu_w = 4/3$,what will be its new focal length in $cm$?

If a lens is moved towards the object from a distance of $40 \,cm$ to $30 \,cm$,the magnification of the image remains the same (numerically). The focal length of the lens is ......... $cm$.

Vedclass Test Series

Exam Paper Generator

Online Exam Module