[Rails] image_tag problem

Hi,
I am new to rails and developing my first application.
At one point I have to display image. I am using-
<%= image_tag("Smileimg2.jpeg", :height => 185, :width => 313) %>
BUT image is not showing in the browser. My image is in public/images
folder, as well as in app/assets/images folder also.
Please help!!

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