First slide

Accuracy; precision of instruments and errors in measurements

Question

To find index error (e) distance between object needle and pole. of the concave mirror is 20 cm. The separation between the indices of object needle and mirror was observed to be 20.2 cm. In some observation, the observed image distance is 20.2 cm and the object distance is 30.2 cm. Find the index error e.

Moderate

A

0.2 cm
B

0.4 cm
C

0.6 cm
D

0.8 cm

Solution

Index error e= observed distance - actual distance
= separation between indices - distance between object needle and pole of the mirror
=20.2-20.0=0.2 cm

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