Lens & Lens Formula

State what quantity the symbol 'f' represents with respect to the lens formula.

• focal length
• image length

• object length

• focal point

State what quantity the symbol 'v' represents with respect to the lens formula.

• focal length
• image length

• object length

• focal point

State what quantity the symbol 'u' represents with respect to the lens formula.

• focal length
• image length

• object length

• focal point

Write the mathematical equation relating f to both v and u.

Determine the image distance and image height for a 6.8cm tall object placed 10.0cm from a converging lens of focal length 14.0cm

• image distance = 30cm,
  image height = 20.3 cm

• image distance = -35cm,
  image height = -23.8 cm

• image distance = 10cm,
  image height = 5.9 cm

• image distance = -2.3cm,
  image height = -6.3 cm

A magnified, inverted image is located at a distance of 38.0cm from the converging lens with a focal length 10.0cm.
Determine the object distance and tell whether the image formed is real or virtual.

• The object distance is 50.0 cm and the image formed is virtual.

• The object distance is 20.8 cm and the image formed is real.

• The object distance is 5.0 cm and the image formed is virtual.
• The object distance is 13.6 cm and the image formed is real.

An inverted image is magnified by 2 when the object is placed 26cm in front of a converging lens.
Determine the image distance and focal length of the lens.

• image distance = -26cm
  focal length = 13cm

• image distance = 52cm
  focal length = -17.3cm

• image distance = -52cm
  focal length = -17.3cm

• image distance = 52cm
  focal length = 17.3cm