[" 21.A "10" mm long awl pin is placed v...

[" 21.A "10" mm long awl pin is placed vertically in front of a concave mirror."A" s "],[" mm long image of the awl pin is formed at "30cm" in front of the mirror.The "],[" focal length of this mirror is "],[[" (a) "-20cm," (b) "-30cm," (c) "-40cm," (d) "-60cm]]

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[" 21.A "10" mm long awl pin is placed vertically in front of a concave mirror."A" s "],[" mm long image of the awl pin is formed at "30cm" in front of the mirror.The "],[" focal length of this mirror is "],[[" (a) "-20cm," (b) "-30cm," (c) "-40cm," (d) "-60cm]]

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