मैं व्यक्त से हूं समाने
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f=
4D
D
2
−Δ
2
this is formula of finding focal length using displacement method.
f:− focal length
Δ:− displacement of lens done in order to get image again on screen.
D:− distance between object and screen.
f=
4×10
10
2
−2
2
f=2.4 cm
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