Caml Query with Lookup field 

<Query>
  <Where>
    <Eq>
      <FieldRef Name='Fruit' />
      <Value Type='Lookup'>Grapes</Value>
    </Eq>
  </Where>
</Query>
<Query>
  <Where>
    <Eq>
      <FieldRef Name='Fruit' LookupId='TRUE' />
      <Value Type='Lookup'>15</Value>
    </Eq>
  </Where>
</Query>

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