At what distance should an object be placed from a convex lens of focal length 18 cm to obain an image at 24 cm from it one the other side? What will be the magnification produced in this case?

At what distance should an object be placed from a convex lens of focal length 18 cm to obtain an image at 36 cm from it ? What will be the magnification produced in this case?

At what distance should be placed from a convex lens of focal length 15 cm to obtain an image three times the size of the object?

At what distance should an object be placed from a lens of focal length 25 cm to obtain an image on a screen placed at a distance of 50 cm from the lens ? What will be the magnification produced in this case?

At what distance an object must be placed from a lens of focal length 15 cm to get an inverted image of unit magnification ?

A convex lens has focal length of 30cm. Calculate at what distance should the object be placed from the lens so that it forms at 60 cm on the other side of the lens ? Find the magnification produced by the lens in this case.

An object is placed at 5cm from a convex lens of focal length 15cm. What is the position and nature of the image ?

A concave lens has focal length of 15 cm. At what distance should the object from the lens be placed so that it forms an image at 10 cm from the lens ? Also find the magnification produced by the lens.

A concave lens has focal length of 15 cm. At what distance should the object from the lens be placed so that it forms an image at 10 cm from the lens ? Also find the magnification produced by the lens.