logo

Ask Questions, Get Answers

 
X
 Search
Want to ask us a question? Click here
Browse Questions
Ad
Home  >>  EAMCET  >>  Physics
0 votes

The objective lens of an optical Instrument is an achromat combination with a focal length of 90 cm. The two lenses possess dispersive powers 0.024 and 0.036 respectively and are in contact with each other. Then their focal lengths are

$\begin {array} {1 1} (1)\;-30\: cm, \: 45\: cm & \quad (2)\;45\: cm, 30\: cm \\ (3)\;30\: cm, -45\: cm & \quad (4)\;30\: cm, -30 \: cm \end {array}$

Can you answer this question?
 
 

1 Answer

0 votes
(3) 30 cm, -45 cm
answered Nov 7, 2013 by pady_1
 

Related questions

Ask Question
student study plans
x
JEE MAIN, CBSE, NEET Mobile and Tablet App
The ultimate mobile app to help you crack your examinations
Get the Android App
...