Question

please say the answers ​

Answer 1

Answer:

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Step-by-step explanation:

we got f = -15 cm

to get the radius of curvature

We knew that

f = 2R

$- 15 = 2r \\ 2r = - 15 \\ r = \frac{ - 15}{2} \\ r \: - 7.5cm$

therefore the radius of curvature is -7.5cm