Fill in the blank spaces with appropriate answers:
A convex mirror of focal length 'f' produces an image `(1/n)` of the size of the object. The object distance is ________.

Fill in the blank spaces with appropriate answers: A concave mirror of focal length 'f' produces a real image of size n-times that of the object. The object distance is _________.

Fill in the blank spaces with appropriate answers: A concave mirror of focal length 'f' produces a virtual image of size n-times that of the object. The object distance is ________.

Fill in the blank spaces with appropriate answers: A __________ mirror is used as dentists' mirror.

Fill in the blank spaces with appropriate answers: A ________ mirror is used as a rear view mirror.

Fill in the blank spaces with appropriate answers: The focal length of a divergent lens is 40 cm. The power of the lens is ___ Diopter.