A camera fitted with a lens of focal length 50 mm is being used to photograph a flower that is 5 cm in diameter. The flower is placed 20 cm in front of the camera lens.
(a) At what distance from the film should the lens be adjusted to obtain a sharp image of the flower?
(b) What would be the diameter of the image of the flower on the film?
(c) What is the nature of camera lens?
(a) focal length, f = 50mm
object distance, u = -20 cm
Using len’s formula,
Image distance, v = + 6.66 cm ;
The film should be at a distance of 6.66 cm behind the camera lens
(b) the diameter of the image of the flower on the film is 1.66 cm
(c) the nature of camera lens is Convex lens