An object is placed at a large distance in front of a concave mirror of radius of curvature 40 cm. The image will be formed in front of the mirror at a distance of : ( (a) 20 cm (b) 30 cm c) 40 cm (d) 50 cm

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Solution

Answer: (a) 20 cm

Explanation:
We have
$straight u equals infinity straight R equals 40 space cm straight f equals 40 over 2 equals 20 space cm focal space length space of space concave space mirror comma space straight f equals negative 20 space cm 1 over straight v plus 1 over straight u equals 1 over straight f 1 over straight v plus 1 over infinity equals fraction numerator 1 over denominator negative 20 end fraction 1 over straight v equals fraction numerator 1 over denominator negative 20 end fraction straight v equals negative 20 space cm$
So, The image will be formed in front of the mirror at a distance of 20cm

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An object is placed at a large distance in front of a concave mirror of radius of curvature 40 cm. The image will be formed in front of the mirror at a distance of : ( (a) 20 cm (b) 30 cm c) 40 cm (d) 50 cm

Answer: (a) 20 cm Explanation: We have So, The image will be formed in front of the mirror at a distance of 20cm