Hindi, asked by hany33, 8 months ago

मैं व्यक्त से हूं समाने​

Answers

Answered by helper65
5

Answer:

please mention the full question

Answered by Anonymous
0

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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