Question

A concave mirror has a radius of curvature of 20 cm. For which one of the following object distances will the image be real, inverted and smaller than the object?

Answer 1

if the object distance is greater than 20 cm(R = 2*f), the image will be real, inverted and smaller than the object.

when object distance = R (2*f)

image distance = R(2*f)

image size is exactly equal to object size.

but if object distance is less than R(2*f) and greater than f, we get a real image and image size will be greater than object size.