help@askiitians.com

1800-150-456-789

AIPMT> 2 lenses in contact made of materials wit...

question mark

2 lenses in contact made of materials with dispersive powers in the ratio 2:1, behave as an achromatic convex lens of focal length 10cm. The individual focal length of the lenses are

Blessy Mariya Joseph , 6 Years ago

Grade

1 Answers

Eshan

Last Activity: 6 Years ago

Dear student,

Since the dispersive powers are in the ratio 2:1, so are the magnitudes of focal lengths.

Hence $\dfrac{f_1}{f_2}=-2 \implies f_1=-2f_2$

Also the focal length of combination is 10cm.
$\dfrac{1}{10}=\dfrac{1}{f_1}+\dfrac{1}{f_2}=-\dfrac{1}{2f_2}+\dfrac{1}{f_2}$

$\implies f_2=5cm , f_1=-10cm$

Provide a better Answer & Earn Cool Goodies

Enter text here...

LIVE ONLINE CLASSES

Prepraring for the competition made easy just by live online class.

Full Live Access

Study Material

Live Doubts Solving

Daily Class Assignments

Ask a Doubt

Get your questions answered by the expert for free

Enter text here...

NEET COACHING FOR GRADE 9 STUDENT IN ABU DHABI,UAE. What are the options available

aipmt

0 Answer Available

Last Activity: 3 Years ago

Explaination on the strength of bonds in the figure

aipmt

0 Answer Available

Last Activity: 3 Years ago

Mam today in neet ug 2021 due to my nervousness I bubbled one wrong figure of my roll number but I have filled the roll number correctly in the blocks the invigilator adviced me to leave it as it is and to bubble the same correct figure so I did that .am very much worried what will happen

aipmt

0 Answer Available

Last Activity: 3 Years ago

Magnetic Length of bar magnet of length 70 cm is 63 cm. Want a solution for this.

aipmt

0 Answer Available

Last Activity: 3 Years ago

in the stomatal apparatus why are subsidiary celss absent in cucurbits?

aipmt

1 Answer Available

Last Activity: 4 Years ago

View all Questions