Additional Questions And Answers

Ques: What is cornia?

Ans: Outer coat of the eye is white. Its transparent front part is called cornea.

Ques: What is iris? Write the function of iris?

Ans: Behind the cornea, we find a dark muscular structure called iris.

Function;

(i) The iris controls the size of the pupil.

Ques: Give regions;

(i) The outer most covering of eyes are white and hard.

Ans: As it can prevent the inner most part of eyes by accidents.

Ques: Differentiate between regular and diffused reflection. Does diffused reflection mean the failure of the laws of reflection?

Ans:

No, diffused reflection is not due to the failure of the laws of reflection

Ques: Fill in the blanks in the following :

(i) A person 1 m in front of a plane mirror seems to be __1__________ m from his image.

(i) If you touch your ____________ ear with right hand in front of a plane mirror it will be seen in the mirror that your right ear is touched with ____________ .

(iii) The size of the pupil becomes ____________ when you see in dim light.

(iv) Night birds have ____________ cones than rods in their eyes..

Que: Draw a labeled sketch of the human eye.

Ans:

​​​

Ques: What is blind spot?

Ans: At the junction of the optic nerve and the retina, there are no sensory cells, so no vision is possible at that spot. This is called the blind spot.

Ques: write kinds of optic nerves.

Ans: There are two kinds of nerve cells

(i)  Cones, which are sensitive to bright light.

(ii) Rods, which are sensitive to dim light.