An upright object is placed in front of a converging lens at a distance equal to twice the focal length 20cm of the lens. On the other side there is a concave mirror of focal length 15 cm separated fr

Question

An upright object is placed in front of a converging lens at a distance equal to twice the focal length 20cm of the lens. On the other side there is a concave mirror of focal length 15 cm separated from the lens by a distance of 70 cm . Then select the correct statement(s) from the following :-

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The lens ( f = 20 cm) images the object at 40 cm to its right with magnification − 1 ; this point lies at the mirror's centre of curvature ( 70 − 40 = 30 = 2 × 15 cm). The mirror images it back on itself with m = − 1 , and the return pass through the lens images at 40 cm to the lens's left with m = − 1 : overall magnification − 1 - (B) correct. The final image is real, 70 + 40 = 110 cm from the mirror, i.e. 110 − 30 = 80 cm from its centre of curvature - (C) correct.

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