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Q: I need answer please!! ( Answered,   0 Comments )
Subject: I need answer please!!
Category: Reference, Education and News > Education
Asked by: wyzgowski7-ga
List Price: $2.00
Posted: 24 May 2005 10:51 PDT
Expires: 23 Jun 2005 10:51 PDT
Question ID: 525071
When an object is placed 8 millimeters from a concave spherical
mirror, a clear image can be projected on a screen 16 millimeters in
front of the mirror. If the object has a height of 4 millimeters, the
height of the image is?
Subject: Re: I need answer please!!
Answered By: welte-ga on 24 May 2005 18:09 PDT
Hi wyzgowski7-ga, and thanks for your question.

First, here's a good tutorial on lenses and mirrors:

On the first page of this document, we have the equation for magnification:

m = i / p,

where m is the magnification, i is the image distance, and p is the
object distance.  From this, we have

m = i / p = 16mm / 8mm = 2

2 x 4mm = 8mm, so the height of the image is 8mm.

Please feel free to request clarification.

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