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25. A10 mm long awl pin is placed vertically in front of a concave mirror. A 5 mm long image of the awl pin is formed at 30 cm in front of the mirror. The focal length of this mirror is [NCERT Exemplar Problems] (a) – 30 cm (b) – 20 cm (c) – 40 cm (d) – 60 cm

25. A10 mm long awl pin is placed vertically in front of a concave mirror. A 5 mm long image of the awl pin is formed at 30 cm in front of the mirror. The focal length of this mirror is [NCERT Exemplar Problems]
(a) – 30 cm
(b) – 20 cm
(c) – 40 cm
(d) – 60 cm

Grade:12th pass

1 Answers

Pawan Prajapati
askIITians Faculty 8741 Points
27 days ago
Answer: b

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