With a concave mirror, object is placed at an distance of 16 cm from principal focus on the pricipal axis.The image is formed at a distance 4cm from the principal focus. The focal length of the mirror is :
64 cm
10 cm
2 cm
8 cm
Newton's Formula -
- wherein
distance ( along the principal axis ) of the object and image respectively from the principal focus.
Let X1 = 16 cm
X2 = 4 cm
or
cm =8 cm
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