How to use ion-list to make to implement responsiveness feature?

ionic-v1
1

I am using ion-list to show the images on screen. On mobile, the view is alright but on tablet the image is stretched. How can I improve responsiveness.
here is my piece of code

      <ion-list>
              <ion-item ng-repeat="image in images">
                      <img ng-src="image.url" />
              <ion-item>
      </ion-ist>

On tablet in one row I want more than one image. How to ensure that.Please help me out.
I have also tried

               <div class = "col col-50">

to show two images in one row. But due to this mobile is also showing two images in one row.