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  1. S

    Sliding Ladder

    YES, so it by instantaneous axis of rotation. search it up on google if you dont know about it. it becomes very easy
  2. S

    Lens silvered at one face

    Actually it does. Just do it logically. I think that powers add because of formula being 1/v -1/u , so when you add p2 the image of 1 is oblect for 2 so basically it cancels out .p1 +p2 is just using the lens formula ignorantly . Ensure that proper sing and conditions are followed.Hope that helps
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