Physics: convex lens focal length question With Link
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Physics: convex lens focal length question With Link

[From: ] [author: ] [Date: 11-05-11] [Hit: ]
1/f = 1/d(i) + 1/d(o).1/f = 1/(-30) + 1/(-15) ==> f = 1/(-1/30 - 1/15) = -10 cm.(c) I cannot draw this on here, so you will need to do this on your own.I hope this helps!-me also confused.......
only answer A and B and if possible C

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The image is located 15 cm from the lens and is twice as the large as the object, so:
m = h(i)/h(o) = -d(i)/d(o).

(a) Since h(i)/h(0) = 2:
2 = -d(i)/d(o) ==> d(i) = -2d(o) = (-2)(-15) = 30 cm.

(b) To solve this, use:
1/f = 1/d(i) + 1/d(o).

So:
1/f = 1/(-30) + 1/(-15) ==> f = 1/(-1/30 - 1/15) = -10 cm.
(This makes sense since f < 0 for a convex lens.)

(c) I cannot draw this on here, so you will need to do this on your own.

I hope this helps!

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me also confused...;P

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Sure. The answer is B.

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