(B) The power of a lens is given by the formula $P = \frac{1}{f}$,where $f$ is the focal length in meters.Given power $P = +1.5\, D$.Substituting the

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

(B) The power of a lens is given by the formula $P = \frac{1}{f}$,where $f$ is the focal length in meters.Given power $P = +1.5\, D$.Substituting the value,$f = \frac{1}{1.5} = \frac{10}{15} = 0.666...\, m \approx 0.67\, m$.Converting to centimeters,$f = 0.67 \times 100 = 67\, cm$.$A$ lens with positive power and positive focal length is a convex lens.$A$ convex lens is a converging lens.

Class 10 Science Light – Reflection and Refraction Textbook - Light – Reflection and Refraction

Medium

$A$ doctor has prescribed a corrective lens of power $+1.5\, D.$ Find the focal length of the lens. Is the prescribed lens diverging or converging?

A
$67\, cm$; Diverging lens
B
$67\, cm$; Converging lens
C
$15\, cm$; Diverging lens
D
$15\, cm$; Converging lens

Explore More

Browse All

Question Bank

All Subjects

Class 10 Questions

Class 10

Science Questions

Chapter

Light – Reflection and Refraction

Subtopic

Textbook - Light – Reflection and Refraction

Which one of the following materials cannot be used to make a lens?

Easy

View Solution

Name the mirror that can give an erect and enlarged image of an object.

Easy

View Solution

Find out,from the table,the medium having the highest optical density. Also,find the medium with the lowest optical density.
Material medium Refractive index
Air $1.0003$
Ice $1.31$
Water $1.33$
Alcohol $1.36$
Kerosene $1.44$
Fused quartz $1.46$
Turpentine oil $1.47$
Benzene $1.50$
Crown glass $1.52$
Canada Balsam $1.53$
Rock salt $1.54$
Carbon disulphide $1.63$
Dense flint glass $1.65$
Ruby $1.71$
Sapphire $1.77$
Diamond $2.42$

Medium

View Solution

You are given kerosene,turpentine,and water. In which of these does the light travel fastest? Use the information given in the table below.
Material medium Refractive index
Water $1.33$
Kerosene $1.44$
Turpentine oil $1.47$

Medium

View Solution

$A$ spherical mirror and a thin spherical lens have each a focal length of $-15\,cm$. The mirror and the lens are likely to be

Easy

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

Material medium	Refractive index
Air	$1.0003$
Ice	$1.31$
Water	$1.33$
Alcohol	$1.36$
Kerosene	$1.44$
Fused quartz	$1.46$
Turpentine oil	$1.47$
Benzene	$1.50$
Crown glass	$1.52$
Canada Balsam	$1.53$
Rock salt	$1.54$
Carbon disulphide	$1.63$
Dense flint glass	$1.65$
Ruby	$1.71$
Sapphire	$1.77$
Diamond	$2.42$

$A$ doctor has prescribed a corrective lens of power $+1.5\, D.$ Find the focal length of the lens. Is the prescribed lens diverging or converging?

Similar Questions

Which one of the following materials cannot be used to make a lens?

Name the mirror that can give an erect and enlarged image of an object.

You are given kerosene,turpentine,and water. In which of these does the light travel fastest? Use the information given in the table below.Material mediumRefractive indexWater$1.33$Kerosene$1.44$Turpentine oil$1.47$

$A$ spherical mirror and a thin spherical lens have each a focal length of $-15\,cm$. The mirror and the lens are likely to be

Vedclass Test Series

Exam Paper Generator

Online Exam Module

You are given kerosene,turpentine,and water. In which of these does the light travel fastest? Use the information given in the table below.
Material medium Refractive index
Water $1.33$
Kerosene $1.44$
Turpentine oil $1.47$