Homework Help: physics

Posted by help? on Saturday, May 24, 2008 at 1:14pm.

TRUE OR FALSE

The virtual image formed by a convex mirror is always enlarged.
A convex mirror never forms a real image of a real object.
When the object of a concave mirror is inside the focal point, the image is virtual.
The image produced by a convex mirror is always closer to the mirror than it would be in a plane mirror for the same object distance.
A concave mirror always forms a virtual image of a real object.
A virtual image formed by a concave mirror is always enlarged.
A concave mirror always forms an enlarged real image of a real object.

physics - ~christina~, Saturday, May 24, 2008 at 1:22pm
what are your ideas on this?

hint: it depends on the distance of the object from the mirror.
- physics - help?, Saturday, May 24, 2008 at 1:25pm
  they're true false that's all the info given
physics - help?, Saturday, May 24, 2008 at 1:34pm
no it's cool i finally think i got it.

False
True
True
True
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physics - drwls, Sunday, May 25, 2008 at 10:47am
All answers are correct. The next-to-last required a bit of thinking.
1/do must be less than 1/|di| if di is negative (virtual). You also know that f is positive. Therefore
1/do - 1/f = 1/|di|
Therefore 1/do < |1/|di| ;
|di| > do so the image is enlarged.

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