Question

A spherical mirror has a focal length of -10 cm. What type of mirror is it ?

Answer 1

Answer:

it is a concave mirror

Explanation:

we determine the sign of the focal length , object distance and image distance in the basis of sign convention.i.e suppose the mirror to be your origin just like a graph....the principal axis be the x axis..

now as we know the distance in the left on x axis is negative... or we can say distance in the left direction to the mirror are negative..(only distance )

so according to your question the focal length was -10cm....

therefore we can say that the parallel Ray's intersect in the left of the mirror...

and this happens only in the case of concave mirror therefore the correct answer is concave mirror

Answer 2

Answer:

the mirror would be a concave mirror

Explanation:

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