question_answer

A concave lens made of material of refractive index \['{{n}_{2}}'\] is held in a reference medium of refractive index \['{{n}_{1}}'\]. Trace the path of parallel beam of light passing through the lens when: (i) \[{{n}_{1}}={{n}_{2}},\] (ii) \[{{n}_{1}}<{{n}_{2}}\]and (iii\[{{n}_{1}}>{{n}_{2}}\]                

Answer:

                The rays diagrams for the three situations are shown below.