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Asked by kuppusamybose46 | 06 Mar, 2022, 05:16: PM
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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