Question

power of a concave lens is 4.5 diopter find the focal lengthy

Answer 1

Hi
Given
p =4.5
find - focal lengt
so,
p = 1 /f
4.5 = 1 /f
f = 1/4.5
f = 10/ 4.5
f = 0.23 m ( approx )
f = 23 cm ( approx )

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