Human Eyes and Colorful world Science X (10th)

Class X  NCERT Solution, MCQ's  Study Notes, Q & A

Chapter 11 – Human Eyes and Colorful world Science

1. What is the role of pupil in a human eye? [CBSE Exam Paper  2011]

Ans: The pupil controls the amount of light entering the eye.

2. What is the range of vision of a normal human eye? [CBSE Exam Paper  2011]

Ans: 25 cm to infinity

3. Name the part of the human eye that helps in changing the focal length of the eye lens.

[CBSE Exam Paper  2011]

Ans: Ciliary muscles

4. Which coloured component bends the least during the dispersion of white light through prism? [CBSE Exam Paper  2011]

Ans: Red colour deviates the least and violet colour the most.

5. Name the part of the eye [CBSE Exam Paper  2011]

(a) that controls the amount of light entering into the eye. 

(b) that has real, inverted image of the object formed on it.

Ans: The pupil  , Retina

6. A person is advised to wear spectacles with convex lenses. State the defect of vision he is

suffering from. [CBSE Exam Paper  2011]

Ans: Hypermetropia

7. Why is red colour selected for danger signal lights?  [CBSE Exam Paper  2011] 

Ans: Red colour deviates 

8. When one enters a dim-lit room from bright light, one is unable to see the objects in the

room for sometime. Why?  [CBSE Exam Paper  2011]

Ans : Ciliary muscles takes time relax and get original position

9. In an experiment with a rectangular glass slab, a student observed that a ray of light incident at an   angle of 55^o  with the normal on one face of the slab, after refraction strikes the opposite face of the slab   before emerging out into air making an angle of 40^o  with the normal.  What value would you assign to the angle of refraction and angle of emergence? [CBSE Exam Paper  2011]

Ans: Angle of incidence = 55   

Angle of refraction = cannot be determined       

Angle of emergence = 40  

But if we ignore the language used by CBSE and interpret in usual way

Angle of incidence = 55           Angle of refraction = 40

 Angle of emergence = 55

10. A person is advised to wear spectacles with concave lenses. What type of defect of vision is he suffering from? [CBSE Exam Paper  2011]

Ans: Myopia

11. What will be the observed colour of the sky on a planet where there is no atmosphere? Why?

Ans:  Dark, because no light would be scattered to the observer’s eye

For further study 

 

Class 10th Human eye and Atmospheric refraction Notes

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