Question

image distance =-15, object distance = -15 find focal length and type of mirror used​

Answer 1

Answer:

focal length = -7.5

negative sign indicates that it is a convex mirror.

Explanation:

$u = - 15 \: and \: v = - 15 \\ now \: use \: mirror \: formula \: \frac{1}{v } + \frac{1}{u} = \frac{1}{f} \\ \frac{ - 1}{15} + \frac{ - 1}{15} = \frac{1}{f} \\ \frac{ - 2}{15} = \frac{1}{f} \\ f = \frac{ - 15}{2} \\ f = - 7.5 \\ convex \: mirror$

Answered by gauthmath