Self Assessment-Class 10 -Science- Physics-Chapter 11:The Human Eye And The Colourful World

Class 10 -Science-Self Assessment- Physics-Chapter 11:The Human Eye And The Colourful World

Very Short answer

Q1.What kind of lens should a person suffering from myopia and hypermetropia use? 

Q2.  A child sitting in a classroom on the back seat is not able to view what is written on blackboard. What defect of vision does he suffer from? What types of lens should be provided to him to correct the defect? 

Q3.  The spectacles of a person have concave lenses. Which defect of vision is he suffering from? 

Q4.  Which defect of vision is corrected by using cylindrical lens?

Q5.  Which type of retinal cells respond to the intensity of light?

Short answer

Q1. What is meant by colour blindness? What kind of retinal cells are lacking in a person suffering from this defect?

Q2. What is astigmatism? How is it corrected?  

Q3. Explain myopia with the help of a well labelled diagram. How is it corrected by a lens? 

Q4. Explain hypermetropia with the help of a well-labelled diagram. How is it corrected by a lens? 

Q5. Define presbyopia

Long answer – 5 Marks

Q1. Describe the construction of the human eye with a well-labelled diagram. Explain the functioning of its various parts.  

Q2. Explain the power of accommodation of the eye. 

Q3. What are rods and cones? Define their roles. 

Q4. What do you understand by persistence of vision? Give their applications in theatre. 

Q5. Define the power of accommodation of the eye. Define near and far points of the eye.

Numarical Problems

Q1. A person with a defective eye-vision is unable to see the objects nearer than 1.5 m. He wants to read books at a distance of 30 cm. Find the nature, focal length and power of the lens he needs in his spectacles.

Q2. The far point of a myopic person is 80 cm in front of the eyes. What is the nature and power of the lens required to enable him to see very distant objects distinctly?

Q3. Far point of a myopic person is 40 cm. What type of lens, should he wear so as to see the distant objects clearly? Calculate the focal length and the power of the lens he should use.

Q4. The far point of a myopic person is 150 cm in front of the eye. Calculate the focal length and the power of a lens required to enable him to see distant objects clearly.