Physics Help Forum Stucked!

 Light and Optics Light and Optics Physics Help Forum

 Dec 28th 2009, 07:32 PM #1 Junior Member   Join Date: Dec 2009 Posts: 29 Stucked! A bus driver looks into a plane mirror 20 cm long which is placed 50 cm in front of him. If the rear window is 500 cm from the plane mirror, through what length of the rear window can he see whenever he looks into the mirror while driving?
 Dec 29th 2009, 06:40 PM #2 Junior Member   Join Date: Dec 2009 Posts: 29 Waiting patiently for help!
 Dec 29th 2009, 10:36 PM #3 Junior Member   Join Date: Dec 2009 Posts: 6 ans is 220 cm??
 Dec 30th 2009, 03:21 AM #4 Junior Member   Join Date: Dec 2009 Posts: 29 I don't have the answer, neither do I know how to start with this problem.. How about you telling me how you got this answer and we shall discuss?
 Dec 30th 2009, 03:35 AM #5 Senior Member   Join Date: Sep 2009 Location: india Posts: 409 image of window will be 500 cm behind the mirror. so distance from driver=500 +50 =550 cm. next construct two straight lines originating from driver and grazing mirror endpoints and intersecting a portion of the image . find this portion using similarity ie.side proportionality. 10/x=50/550 and find 2x.
Dec 30th 2009, 03:58 AM   #6
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 Originally Posted by r.samanta image of window will be 500 cm behind the mirror. so distance from driver=500 +50 =550 cm. next construct two straight lines originating from driver and grazing mirror endpoints and intersecting a portion of the image . find this portion using similarity ie.side proportionality. 10/x=50/550 and find 2x.
Do you mean drawing a diagram and drawing lines representing the light travel then get the answer?

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