The sun having diameter subtends an angle `theta` at the pole of a cancave mirror of focal length f. What is the diameter of the image of the sun formed by the mirror?

An object is held at the principal focus of a concave lens of focal length F. where is the image formed?

An objects is placed at a distance equal to focal length of convex mirror.If the focal length of the irror be f,then the distance of the image from the pole of the mirror is:

What is the nature of the mirror having focal length - 15 cm?

An object is at a distance of 5 m from a convex mirror of focal length 10 cm.Where is he image formed ?

A short linear object of length b lies along the axis of a concave mirror of focal length f at a distance u from the pole. What is the size of the image?

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.

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

How far from a lamp must a concave mirror of focal length 3 m be placed in order to throw an image on a screen 8 m from the lamp?

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.