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
1/20 = 0.5
Answers
Answered by
4
Given,
f = -20 cm → (-20)÷100 →(- 0.2m)
p = 1÷(-0.2)
→ P = 1×10 ÷(-2)
→ P = -5D
f = -20 cm → (-20)÷100 →(- 0.2m)
p = 1÷(-0.2)
→ P = 1×10 ÷(-2)
→ P = -5D
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Answered by
0
the distance between the optical center and it's focus is called its focal length
focal length =
power = 005D
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