Describe a photographic camera.

Write 'True' or 'False': The part of an eye which acts as a diaphragm of a photographic camera is iris.

What are the chances that no two boys are sitting together for a photograph if there are 5 girls and 2 boys:

Describe neuron.

Describe eutrophication.

A camera lens of focal length 5 cm is mounted on a fine screw thread for adjusting the focus.What range of movement is neede,if the amer ais to be able to take sharp photographs at 1 m as well as from great distances?

Write equations for the reaction of silver bromide with hypo in photographic process.