An achromatic combination of lenses is formed | vedclass

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

Question

(C) For an achromatic combination,the condition is given by $\frac{\omega_1}{f_1} + \frac{\omega_2}{f_2} = 0$.Here,$\omega_1$ and $\omega_2$ are the d

Vedclass · Accepted Answer

$1$ convex lens and $1$ concave lens

Vedclass · Answer

(C) For an achromatic combination,the condition is given by $\frac{\omega_1}{f_1} + \frac{\omega_2}{f_2} = 0$.Here,$\omega_1$ and $\omega_2$ are the dispersive powers of the two lenses,and $f_1$ and $f_2$ are their respective focal lengths.Since the dispersive powers $\omega_1$ and $\omega_2$ are always positive,the focal lengths $f_1$ and $f_2$ must have opposite signs for the sum to be zero.This implies that one lens must be convex (positive focal length) and the other must be concave (negative focal length).Therefore,an achromatic combination is formed by joining $1$ convex lens and $1$ concave lens.

An achromatic combination of lenses is formed by joining

Similar Questions

$A$ convex lens of focal length $A$ and a concave lens of focal length $B$ are placed in contact with each other. The focal length of this combination is ......

Concave and convex lenses are placed touching each other. The ratio of the magnitudes of their power is $2:3$. The focal length of the system is $30 \ cm$. Then the focal lengths of the individual lenses are:

Concave and convex lenses are placed touching each other. The ratio of magnitudes of their power is $2:3$. The focal length of the system is $30 \ cm$. The focal lengths of individual lenses are

The power of an achromatic convergent lens combination consisting of two lenses is $+ 2D$. The power of the convex lens is $+ 5D$. The ratio of the dispersive power of the convex lens to the concave lens will be:

Two plano-convex lenses,each of focal length $10 \, cm$ and refractive index $3/2$,are placed as shown in the figure. The space between them is filled with water $\left( \mu = 4/3 \right)$. The whole arrangement is in air. The optical power of the system is ....... $D$.

Vedclass Test Series

Exam Paper Generator

Online Exam Module