Optoelectronics, Optics, Lights and Lasers
May 21, 2012, 01:10:06 PM *
Welcome, Guest. Please login or register.

Login with username, password and session length
News:
 
   Home   Help Search Login Register  
Optoelectronics, Optics, Lights and Lasers > The Science of Light > Optics > 

A spherical concave lens has a focal length of 20 cm and an object is placed 10 cm from the lens. Draw a ray d?

Pages: [1]
« previous next »
  Print  
Author Topic: A spherical concave lens has a focal length of 20 cm and an object is placed 10 cm from the lens. Draw a ray d?  (Read 243 times)
redwan
Newbie
*
Posts: 1


View Profile
« on: June 20, 2011, 04:02:43 AM »
A spherical concave lens has a focal length of 20 cm and an object is placed 10 cm from the lens. Draw a ray diagram. Estimate the image distance in cm?
Logged
Old_Science_Guy
Newbie
*
Posts: 4


View Profile
« Reply #1 on: June 20, 2011, 05:52:19 AM »
wouldn't it be nice if YA had an app for drawing diagrams?

anyway
1/f = 1/do + 1/di
f = -20 cm  (concave lenses are diverging lenses)
do = + 10 cm
solve for di

I get about -6.67 cm  ( that is behind the lens)
the image will be upright and smaller than the object
Logged
Pages: [1]
  Print  
« previous next »
 
Jump to:  

Powered by MySQL Powered by PHP Powered by SMF 1.1.13 | SMF © 2006-2011, Simple Machines LLC | Privacy Policy Valid XHTML 1.0! Valid CSS!