The focal length of a concave lens is 30 cm. Where should an object be placed so that its image is `1//10` of its size ?

The focal length of a concave mirror is 50cm. Where an object be placed so that its image is two times and inverted

The focal length of a concave mirror is 50cm. Where an object be placed so that its image is two times and inverted

The focal length of a concave mirror is 12 cm . Where should an object of length 4 cm be placed so that a real image of 1 cm length is formed ?

The focal length of a concave lens is 30 cm. At what distance should the object be placed from the lens so that it forms an image at 20cm from the lens?

The focal length of a concave lens is 20 cm, if an object is placed at a distance of 50 cm in front of this concave lens, where is the image formed ? What is the nature of the image ?

At what distance from a concave mirror of focal length 25 cm should an object be placed so that the size of image is equal to the size of the object.

A diverging lens of focal length 12 cm and a converging mirror of focal length 10 cm are placed coaxially at a separation of 5 cm. Where should an object be placed so that a real image is formed at the object itself ?