Help physics question optics!!!!
A thin convex lens has front and rear surfaces, each with 8 cm radius of cur-
vature. What is its focal length? (Assume n = 1.5). I used the lens make equation and i keep getting 8cm. However the answer is 7.2cm is the answer wrong or am I going mad?
vature. What is its focal length? (Assume n = 1.5). I used the lens make equation and i keep getting 8cm. However the answer is 7.2cm is the answer wrong or am I going mad?
Sorry you've not had any responses about this. 
Are you sure you’ve posted in the right place? Posting in the specific Study Help forum should help get responses. 
I'm going to quote in Puddles the Monkey now so she can move your thread to the right place if it's needed.
Are you sure you’ve posted in the right place? Posting in the specific Study Help forum should help get responses. I'm going to quote in Puddles the Monkey now so she can move your thread to the right place if it's needed.
Spoiler
Original post by chrisb2567
A thin convex lens has front and rear surfaces, each with 8 cm radius of cur-
vature. What is its focal length? (Assume n = 1.5). I used the lens make equation and i keep getting 8cm. However the answer is 7.2cm is the answer wrong or am I going mad?
vature. What is its focal length? (Assume n = 1.5). I used the lens make equation and i keep getting 8cm. However the answer is 7.2cm is the answer wrong or am I going mad?
The answer is definitely 8cm
Try it here
http://hyperphysics.phy-astr.gsu.edu/hbase/geoopt/lenmak.html
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