Science, asked by shreyaagrawal73, 11 months ago

Hey guyz help me

Define focal length of a lens . A concave lens has a focal length of 20cm . calculate its power.

Anonymous: p = 1/f

Anonymous: 1/20 = 0.5

Answers

Answered by ankitsharma26

Given,
f = -20 cm → (-20)÷100 →(- 0.2m)
p = 1÷(-0.2)
→ P = 1×10 ÷(-2)
→ P = -5D

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Answered by deepsen640

the distance between the optical center and it's focus is called its focal length

focal length =

$\frac{}{ \large\{power}$

power = 005D

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