Part

2017 NECO PHYSICS PRACTICAL  ANSWER
    (2.)
You are provided with Ray box, ascreen, a concave mirror, mirror holder and meter rule...

(2a.)
F = 15cm
(V.)
(A)
= 60.00cm, b =20.00cm
Hence=L=a over b = 60.00 over 20.00
L= 3

(Vi)

Table for reading

S/n. |b(cm).     |a(cm)|L=a over b
1      |   20.00. |60.00|  3.00
2      |  25.00.  |37.00|  1.50
3     |  30.00.    |30.00|  1.00
4     |  35.00.    |26.00|  0.75
5      | 24.00     |24.00|  0.60

(Vii)
Slope =s = ∆l over ∆a  =(3-0.25 over 60-18.6)
S= 2.75 over 41.4 

S = 0.0066425cm^-1

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