Question

The debris can be harmful to the artificial satellites. It can c
Prith the satellites or spacecrafts and damage them. Therefor
ature of artificial satellites or spacecrafts are in danger.
t
Hence, it is necessary to manage the debris.
Assignment
(1) What happens when light falls on the retina ?
(Ch.
(2) Arrange the following metals in the decreasing order of
chemical reactivity : Cu, Mg, Fe, Ca , Zn​

Answer 1

Explanation:

(1) when light falls on retina the rods and cones identify the colour and intensity of the the object. After this the signal passes to the optical nerves which carry it to the brain which interprets it with the earlier seen images and show us what we see. Retina acts as a screen which shows images inverted and these inverted images are are made proper by the brain.

(b) Ca,Mg,Zn,Fe,Cu