Question

radius of curvature of spherical mirror is 20 CM .a type of mirror is__​

Answer 1

Answer:

Radius of curvature = 2 x focal length.

So, focal length =

2

1

× radius of curvature =

2

1

×20 cm = 10 cm

Answer 2

Explanation:

Focal length = R/2 = 20/2 = 10

So, here focal length is +ve.

And we know that,

According to the sign convention,

• Focal length of concave mirror is -ve.
• And that of the convex mirror is +ve.

So, the type of mirror is convex mirror.