Assertion (A): Concave lens is used to correct myopia  or short- sightedness.  

Reason (R): A concave lens of suitable focal length  diverges the parallel rays from the distant objects  as if they are coming from the far point of the  myopic eye. This helps the eye lens to form a clear image at the retina.  

 

Answer

 

  • A person with myopia can see nearby objects clearly but cannot see distant objects distinctly. 
  • A concave lens of suitable focal length  diverges the parallel rays from the distant objects as  if they are coming from the far point of the myopic  eye. This helps the eye lens to form a clear image at the retina

So, a concave lens is used to correct myopia  or short- sightedness.  

myopia---teachoo.jpg

 

Thus,

  • Assertion is True
  • Reason is True
  • And reasoning is the correct explanation for assertion.

 

So, the correct answer is (a)

  1. Class 10
  2. Chapter 11 Class 10 - Human Eye and Colourful World (Term 1)
Class 10
Chapter 11 Class 10 - Human Eye and Colourful World (Term 1)

About the Author

CA Maninder Singh's photo - Founder at Teachoo
CA Maninder Singh
CA Maninder Singh is a Chartered Accountant for the past 11 years and a teacher from the past 11 years. He teaches Science, Accounts and English at Teachoo