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CBSE Notes 2011-2012

A 10 mm long awl pin is placed vertically in front of a concave mirror. A 5 mm long image of the awl...

Multiple choice question

A 10 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

unknown

- 3 0 cm'

unknown

- 2 0 cm'

unknown

'- 4 0 cm'

unknown

' - 6 0 cm'