A concave mirror of small aperture forms a sharper image.Why?

A concave mirror of focal length 25 cm forms the real image of a point object at a distance O lying on its principal axis at a distance of 50 cm from the mirror. The mirror is cut into two halves and are drawn a distance of 1 cm apart in the direction perpendicular to the optical axis .How will the two halves of the concave mirror produce the image of the point object O?

A concave mirror of focal length 15 cm forms an image having twice the linear dimenstions of the objet.The position of the object,when the image is virtual,will be

If a concave mirror of focal length f produces a real image n times the size of the object,then find the distance of the object from the mirror.

A concave mirror produces three times magnified real image of an object placed at a 10 cm in front of it. Find where will the image be formed?

Why is a concave mirror preffered to plane mirror for shaving?

Use the mirror equation to deduce that: an object placed between the pole and focus of a concave mirror produces a virtual and enlarged image.

An object is placed in front of a concave mirror of radius of curvature 40 cm at a distance of 10 cm.Find the position and magnification of the image.

A concave mirror is used in opthalmoscope .Why?