Describe the experiment 'to cut and bend the glass tube into
i) right angle
ii) obtuse angle
iii) acute angles
iv) capillary tube
v) jet tube

The human eye contains a molecule called 11-cis-retinal that changes shape when struck with light of sufficient energy. the change in shape triggers a series of events that results in an electrical signal being sent to the brain that results in vision. the minimum energy required to change the conformation of 11-cis-retinal within the eye is about 164 kj/mol.