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Asked by kuppusamybose46 | 06 Mar, 2022, 05:16: PM
answered-by-expert Expert Answer
Figure shows the system of Concave lens and mirror as given in the question.
Focal length of concave lens is 20 cm. Distance between lens and mirror is 20 cm .
 
Since light is coming from far away distance , light rays are parallel to optical axis .
Then these parallel rays are getting diverged and incident on mirror and getting reflected as shown in figure.
 
Virtual image I is obtained by extending the reflected ray behind mirror at B and D as shown in figure.
 
ΔFBE and ΔIBE are congruent triangles .
 
Hence image distance behind the mirror is 40 cm that can be seen from figure.
 
Hence image is formed at 40 cm behind the mirror
Answered by Thiyagarajan K | 06 Mar, 2022, 08:13: PM

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