PS section

[akalin24]

Did anyone get 10cm for a focal length question on the PS section???

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[kiahs]

i though it was five 1/f = 2/r so shouldn't r= f/2? I contemplated this for like three minutes

 

[ASDIC]

i used focal length = 0.5 x radius of curvature....i think i got 10

 

[akalin24]

I used the lens makers equation 1/f=1/o+1/i

I think I blew that one!

 

[UCLAstudent]

I got 5 cm.

1/f = 2/R
f = R/2 = 10/2 = 5 cm

 

[mrsmotivation]

5 cm f=R/2