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Poll

The radius of curvature of the concave mirror used by the student in the above activity is:

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Poll Results

57.63%[A] 60 cm ( 34 voters )
11.86%[B] 40 cm ( 7 voters )
30.51%[C] 30 cm ( 18 voters )
0%[D] 10 cm
Based On 59 Votes

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The focal length of the mirror is the distance between the pole of the mirror & the screen where the clear image of the distant object is formed. As the mirror stand is at 10cm & screen is at 40 cm, therefore, focal length = 40 – 10 = 30 cm

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