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<problem>
  <include>
    <parserlib> multiple_true </parserlib>
  </include>
  <part required="true">
    <answergroup>
      <outtext>
	Identify as true or false the following statements concerning
	images formed by a SINGLE OPTICAL ELEMENT.  The element may be a
	plane mirror, a concave mirror, a convex mirror, a converging
	lens, or a diverging lens.
	<tex> \newline </tex>
      </outtext>
      <block condition="&hinton()">
	<outtext>
	  Recall that real images are on the opposite side of a single
	  lens from the object. Real images for a mirror are on the
	  same side as the object.
	</outtext>
      </block>
      <multipletrue option="atleastonetrue">
	<multipletrueconcept description="Real Image Size">
	  <multipletrueresponse value=false>
	    <foil>
	      <check style="check"> 
		Real images are always smaller than objects. <br>
	      </check>
	    </foil>
	  </multipletrueresponse>
	  <multipletrueresponse value=false>
	    <foil>
	      <check style="check"> 
		Real images are always larger than objects. <br>
	      </check>
	    </foil>
	  </multipletrueresponse>
	</multipletrueconcept>
	<multipletrueconcept description="Virtual Image Direction">
	  <multipletrueresponse value=true>
	    <foil>
	      <check style="check"> 
		Virtual images are always  upright (i.e., of the same vertical
		orientation as the objects).
	      </check>
	    </foil>
	  </multipletrueresponse>
	  <multipletrueresponse value=false>
	    <foil>
	      <check style="check"> 
		Virtual images can be inverted (i.e., of the opposite vertical
		orientation as the object which formed it).
	      </check>
	    </foil>
	  </multipletrueresponse>
	</multipletrueconcept>
	<multipletrueconcept description="Real Image Direction">
	  <multipletrueresponse value=true>
	    <foil>
	      <check style="check"> 
		Real images are always inverted (i.e., of the opposite
		vertical orientation as the object).
	      </check>
	    </foil>
	</multipletrueresponse>
	  <multipletrueresponse value=false>
	    <foil>
	      <check style="check"> 
		Real images can be upright (i.e., of the same vertical
		orientation as the object).
	      </check>
	    </foil>
	  </multipletrueresponse>
	</multipletrueconcept>
	<multipletrueconcept description="Where an object is relative 
	  to its image">
	  <multipletrueresponse value=true>
	    <foil>
	      <check style="check"> 
		The real image by a mirror is always on the same side as
		the object. 
	      </check>
	    </foil>
	  </multipletrueresponse>
	  <multipletrueresponse value=false>
	    <foil>
	      <check style="check"> 
		A mirror creates a virtual image on the same side as the
		object.
	      </check>
	    </foil>
	  </multipletrueresponse>
	  <multipletrueresponse value=false>
	    <foil>
	      <check style="check"> 
		A mirror creates a real image on the side opposite the
		object.
	      </check>
	    </foil>
	  </multipletrueresponse>
	  <multipletrueresponse value=true>
	    <foil>
	      <check style="check"> 
		The virtual image by a mirror is always on the side
		opposite the object. 
	      </check>
	    </foil>
	  </multipletrueresponse>
	</multipletrueconcept>
	<showrandomfoil/>
	<showrandomfoil/>
	<showrandomfoil/>
	<showrandomfoil/>
      </multipletrue>
    </answergroup>
  </part>
</problem>