Question

the human eye is very similar to a photographic camera the figure given shows the main part of the photographic camera now answer the following questions.
1)name the parts of human eyes similar to the following part of the photographic camera.a) photographic film
b)aperture

2)state one difference between the human eye lens and camera lens .

3)name the muscles which as adjust the curvature of the eye lens.

4)which phenomenon of light is responsible for the working of the eye?

Answer 1

1) a) retina
b) pupil

2) In humans the lens is fexible, it can thicken and thinned whereas in camera the lens is fixed.

3) ciliary muscles

4) The phenomenon is 'Retraction of light' which helps in focusing the light of environment into the yellow spot of retina.

Answer 2

1) a) the retina in the human eye is similar to photographic film in a camera.
b) The pupil in the human eye is similar to the aperture in camera.

2) In focal length of camera, the focal length of the lens is fixed and the distance of the image from the lens is changes when the position of the lens is changed. In human eye, the focal length of the eye lens is changed by ciliary muscles and distance of image from the eye is fixed.

3) The ciliary muscles adjust the curvature of the eye lens.

4) The refraction of light is responsible for the working of eye.