LIVE Course for free

Rated by 1 million+ students
Get app now
0 votes
25 views
in Physics by (71.7k points)
closed by
Dolly and Ritu are two friends studying together in `V` grade. They prefer to sit together. Dolly is uncomfortable in reading the blackboard when they are sitting on the last bench. Dolly is depressed fearing that they may turn blind one day. Ritu explains to her that the problem may be due to some minor eye defect and there is no cause for worry. Dolly accompanied by Ritu visits the doctor who prescribes specs of suitable power for her. Dolly is now all smiles and thanks Ritu.
Read the above passage and answer the following questions :
(i) Name the eye defect Dolly is suffering from.
(ii) What could be the cause of this defect ?
(iii) The far point of Dolly is `50 cm`. What is the power of the lens she should use to read from the blackboard ?
(iv) What values are displayed by Ritu ?

1 Answer

0 votes
by (71.8k points)
selected by
 
Best answer
(i) Dolly is suffering from myopia or short sightedness.
(ii) Two possible cause of this defect are :
Increase in size of eye ball or decrease in focal length of eye lens.
(iii) Here,`x = 50 cm`
`f =-50 cm`
`P = (100)/(f) = (100)/(-50)= -2 D`
(iv) Ritu has displayed concern for her friend. She has explained to her that there is no cause for worry and Dolly can be treated for her problem. And the doctor has provided Ritu right.

Welcome to Sarthaks eConnect: A unique platform where students can interact with teachers/experts/students to get solutions to their queries. Students (upto class 10+2) preparing for All Government Exams, CBSE Board Exam, ICSE Board Exam, State Board Exam, JEE (Mains+Advance) and NEET can ask questions from any subject and get quick answers by subject teachers/ experts/mentors/students.

Categories

...