Question

Note : i) Answer all the questions.
ii) Each question carries 4 marks.
11. How do you appreciate the working of iris in the eye
12. An element has atomic number 17. Where would you ex
Table? Why?
13. Three objects, A at 30°C, B at 303K and C at 420K are
Then answer the following questions.
i) Which are in "Thermal equilibrium” among A,B and​

Answer 1

Answer:

Explanation:

11} a}Iris consists of muscles which helps in controlling the amount of light entering the eye through pupil.

b}Increase of low light the iris makes the pupil to expand and allow more light to. ...

C}In case of bright (or) excess light the iris makes the pupil to contract

13}in  body A and body B are in Thermal equilibrium as they have the same temperature decrease the amount of light entering the eye.