(A) To form an achromatic doublet,we combine a convex lens of crown glass with a concave lens of flint glass.The condition for achromatism is $\frac{\

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

Convergent of crown and divergent of flint

(A) To form an achromatic doublet,we combine a convex lens of crown glass with a concave lens of flint glass.The condition for achromatism is $\frac{\omega_1}{f_1} + \frac{\omega_2}{f_2} = 0$,where $\omega$ is the dispersive power and $f$ is the focal length.Since crown glass has lower dispersive power $(\omega_c Thus,the correct combination is a convergent lens of crown glass and a divergent lens of flint glass.

Class 12 Physics Ray Optics and Optical Instruments Refraction by Lenses

Easy

An achromatic telescope objective is to be made by combining the lenses of flint and crown glasses. This proper choice is

A
Convergent of crown and divergent of flint
B
Divergent of crown and convergent of flint
C
Both divergent
D
Both convergent

Explore More

Browse All

Question Bank

All Subjects

Class 12 Questions

Class 12

Physics Questions

Chapter

Ray Optics and Optical Instruments

Subtopic

Refraction by Lenses

The radius of curvature of the convex surface of a thin plano-convex lens is $15 \, cm$ and the refractive index of its material is $1.6$. The power of the lens will be:

Medium

View Solution

$A$ convex lens of crown glass $(n = 1.525)$ will behave as a divergent lens if immersed in:

Easy

View Solution

The size of the real image produced by a convex lens of focal length $F$ is '$m$' times the size of the object. The image distance from the lens is

MediumMHT CET 2023

View Solution

The focal length of a biconvex lens made of glass with equal radii of curvature is $f$. If the lens is dipped in water, what will be its new focal length? (Take the refractive index of glass as $3/2$ and water as $4/3$)

DifficultTS EAMCET 2021

View Solution

Radii of curvature of a converging lens are in the ratio $1 : 2$. Its focal length is $6 \,cm$ and refractive index is $1.5$. Then its radii of curvature are ......... respectively.

EasyKCET 2013

View Solution

Vedclass Products

For Students

Vedclass Test Series

Mock tests in real JEE/NEET style with performance analysis. 5-day free trial.

Start Free Trial

For Teachers

Exam Paper Generator

Generate Set A/B/C/D exam papers from 7.5L+ questions in 2 minutes. 3 chapters free.

Try Free

For Institutes

Online Exam Module

Live online exams with unlimited students, 360° analytics & white-label branding.

See Demo

An achromatic telescope objective is to be made by combining the lenses of flint and crown glasses. This proper choice is

Similar Questions

The radius of curvature of the convex surface of a thin plano-convex lens is $15 \, cm$ and the refractive index of its material is $1.6$. The power of the lens will be:

$A$ convex lens of crown glass $(n = 1.525)$ will behave as a divergent lens if immersed in:

The size of the real image produced by a convex lens of focal length $F$ is '$m$' times the size of the object. The image distance from the lens is

The focal length of a biconvex lens made of glass with equal radii of curvature is $f$. If the lens is dipped in water, what will be its new focal length? (Take the refractive index of glass as $3/2$ and water as $4/3$)

Radii of curvature of a converging lens are in the ratio $1 : 2$. Its focal length is $6 \,cm$ and refractive index is $1.5$. Then its radii of curvature are ......... respectively.

Vedclass Test Series

Exam Paper Generator

Online Exam Module