A concave mirror of focal length `10 cm` is placed at a distance of `35 cm` from a wall. How far from the wall should an object be placed to get its image on the wall ?

A concave mirror of focal length 20 cm is placed at a distance of 50 cm from a wall. How far from the wall should an object be placed to form its real image on the wall ?

A convex lens of focal length 10 cm is placed at a distance of 12 cm from a wall. How far from the lens should an object be placed so as to form its real image on the wall?

A convex mirror of focal length 20 cm is placed 50 cm from a wall. How far the wall should an object be placed to form a real image on the wall ?

A converging lens of focal length 5 cm is placed at a distance of 20 cm from a screen. How far from the lens should an object be placed so as to form its real image on the screen?

A 2.5 cm high candle flame is placed at a distance of 2.5 m from a wall. How far from the wall a concave mirror must be placed so that a 7.5 cm high inverted image of the flame is formed on the same wall? Also calculate the focal length of the mirror.

A candle flame 2 cm high is placed at distance of 2 meter from a wall. How far from the wall must a concave mirror to placed in order to form an image of the flame 6 cm high on the wall ?

If an object is placed at a distance of 5 cm from a plane mirror, how far would it be from its image ?