The focal length of a concave mirror is 30 cm. Find the positiion of the object in front of the mirror so that the image is three tiems the size of the object.

The focal length of a convex lens is 30 cm and the size of image is quarter of the object.Them,the object distance is

A convex mirror forms an imge,which is 1//n times the size of the object .If the focal length of the mirror is f,the distance of the object is

The radius of curvature of a concave mirror is 30 cm what is its focal length?

If the radius of curvature of convex mirror is 40 cm and size of object is twice as that of the image,then the object distance is

When the image formed by a concave mirror is at infinity then what is the position of the object?

We wish to obtain an erect image of an object, using a concave mirror of focal length 15cm what should be the range of distance of the object from the mirror? What is the nature of the image ? Is the image larger or smaller than object? Draw a ray diagram to show the image formation in this case.

An erect image of 3 tiems the size of the object is obtined with a conccave mirror of radius of curvature 36 cm.What is the position of the object?