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 concave mirror of focal length 10 cm is placed at a distance 35 cm from a wall. How far from the wall should an object be placed so that its real image is formed 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 candle is flame 1 cm high is placed at a distance of 1.5 metre from a wall.How far from the wall must a concave mirror be placed ,so that it may form a 2 cmhigh image of the flame on the flame on the same wall?Also find the focal length of the mirror.

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.