Optoelectronics, Optics, Lights and Lasers
May 21, 2012, 01:16:18 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 > 

Convex Lens help? 10 points!?

Pages: [1]
« previous next »
  Print  
Author Topic: Convex Lens help? 10 points!?  (Read 238 times)
Steve
Newbie
*
Posts: 41


View Profile
« on: June 20, 2011, 03:29:07 PM »
A convex lens is needed to produce an image that is .50 times the size of the object and located 30 cm behind the lens. What focal length should be specified?

The equation i am supposed to use are 1/f=1/di+do where f=focal point, di=distance from lens to image, and do=distance from mirror to original object.
Logged
rex
Newbie
*
Posts: 72


View Profile
« Reply #1 on: June 20, 2011, 07:49:15 PM »
Your equation is faulty.... perhaps just a typo

Magnification = Image height / Object height = 0.5

Image distance / Object distance  = Image height/ Object height  = 0.5

30 / Object distance  = 0.5

Object distance = 60 cm

1/f = 1/do  +  1/ di   = 1/60 + 1/ 30

f = 20 cm
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!