Browse by Stream
QnA
Home
QnA
Go To Your Study Dashboard

Get Answers to all your Questions

header-bg qa
  • Home
  • Medical
  • Give answer! A person can see clearly objects only when they lie between 50 cm and 400 cm from his eyes. In order to increase the maximum distance of distinct vision to infinity, the type and power of the correcting lens, the person has to use, will

A person can see clearly objects only when they lie between 50 cm and 400 cm from his eyes. In order to increase the maximum distance of distinct vision to infinity, the type and power of the correcting lens, the person has to use, will be

  • Option 1)

    convex, + 2.25 diopter

  • Option 2)

    concave, - 0.25 diopter

  • Option 3)

    concave, - 0.2 diopter

  • Option 4)

    convex, + 0.15 diopter

 

Answers (1)

best_answer

As we learnt in

Optical power of a mirror -

P= -frac{1}{f}

 

- wherein

f= focal length with sign and is in meters unit of power = diopter

 

 

 

This person wants to increase the farther distance from 400 cm to \infty. Hence he must use a lense who will form image of an object which is place at infinity to 400 cm.

Hence focal length of the lens = 400 cm.

It must be concave 

P = \frac{-1}{400}cm = \frac{-1}{4} D

P=-0.25 \:\: D

 


Option 1)

convex, + 2.25 diopter

This solution is incorrect.

Option 2)

concave, - 0.25 diopter

This solution is correct.

Option 3)

concave, - 0.2 diopter

This solution is incorrect.

Option 4)

convex, + 0.15 diopter

This solution is incorrect.

Posted by

Plabita

View full answer

NEET 2024 Most scoring concepts

    Just Study 32% of the NEET syllabus and Score up to 100% marks

Similar Questions

Trending Articles/News

anam-khan

NTA Overhaul: 1,000 secure exam centres, biometrics to prevent fraud, question paper changes, suggests panel
anam-khan

NEET syllabus 2025 out; NMC uploads subject-wise topics
anam-khan

What changes in NEET UG? Experts’ panel suggests multi-stage exam, security overhaul, simpler process to NTA

Latest Question