Class 10 Exam  >  Class 10 Questions  >  If a person uses spectacles of power + 1.0 di... Start Learning for Free
If a person uses spectacles of power + 1.0 dioptre, what is the nearest distance of distinct vision for him ? Given that near point of the person is 75 cm from the eye.

  • a)
    -298 cm

  • b)
    300 cm

  • c)
    42.86 cm 

  • d)
    +298 cm

Correct answer is option 'C'. Can you explain this answer?
Verified Answer
If a person uses spectacles of power + 1.0 dioptre, what is the neares...
View all questions of this test
Most Upvoted Answer
If a person uses spectacles of power + 1.0 dioptre, what is the neares...
Here we have:-
P=+1 diopter.

and as we know:-
1/f=P
f=1/1 meter
f=1 meter

now we have,
u= infinite, v=? and f= 1m

using lens formula:-

1/f=1/v-1/u
1/1=1/v. ------[since u is infinite, we will ignore it]
v=1m

v=100cm.

so, the right answer is 100cm and surprisingly it isn't in any option.

Thank you.. :-)
Free Test
Community Answer
If a person uses spectacles of power + 1.0 dioptre, what is the neares...
∵ Near point = 75 cm and Power of lens = + 1 D

∴    P = 100 / f ( in cm )

f = 100 / P

= 100 / 1

 

= 100 cm

The distance of distinct vision v can be found as below.

Using lens formula here ,

1/f  = 1/v - 1/u

⇒ 1/v = 1/f + 1/u

= 1 / 100 + 1 / - 75  =  3 - 4 / 300

= - 1 / 300

v = ₋300 cm

=  - 3m  ( in meters )
Attention Class 10 Students!
To make sure you are not studying endlessly, EduRev has designed Class 10 study material, with Structured Courses, Videos, & Test Series. Plus get personalized analysis, doubt solving and improvement plans to achieve a great score in Class 10.
Explore Courses for Class 10 exam

Top Courses for Class 10

If a person uses spectacles of power + 1.0 dioptre, what is the nearest distance of distinct vision for him ? Given that near point of the person is 75 cm from the eye.a)-298 cmb)300 cmc)42.86 cmd)+298 cmCorrect answer is option 'C'. Can you explain this answer?
Question Description
If a person uses spectacles of power + 1.0 dioptre, what is the nearest distance of distinct vision for him ? Given that near point of the person is 75 cm from the eye.a)-298 cmb)300 cmc)42.86 cmd)+298 cmCorrect answer is option 'C'. Can you explain this answer? for Class 10 2024 is part of Class 10 preparation. The Question and answers have been prepared according to the Class 10 exam syllabus. Information about If a person uses spectacles of power + 1.0 dioptre, what is the nearest distance of distinct vision for him ? Given that near point of the person is 75 cm from the eye.a)-298 cmb)300 cmc)42.86 cmd)+298 cmCorrect answer is option 'C'. Can you explain this answer? covers all topics & solutions for Class 10 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for If a person uses spectacles of power + 1.0 dioptre, what is the nearest distance of distinct vision for him ? Given that near point of the person is 75 cm from the eye.a)-298 cmb)300 cmc)42.86 cmd)+298 cmCorrect answer is option 'C'. Can you explain this answer?.
Solutions for If a person uses spectacles of power + 1.0 dioptre, what is the nearest distance of distinct vision for him ? Given that near point of the person is 75 cm from the eye.a)-298 cmb)300 cmc)42.86 cmd)+298 cmCorrect answer is option 'C'. Can you explain this answer? in English & in Hindi are available as part of our courses for Class 10. Download more important topics, notes, lectures and mock test series for Class 10 Exam by signing up for free.
Here you can find the meaning of If a person uses spectacles of power + 1.0 dioptre, what is the nearest distance of distinct vision for him ? Given that near point of the person is 75 cm from the eye.a)-298 cmb)300 cmc)42.86 cmd)+298 cmCorrect answer is option 'C'. Can you explain this answer? defined & explained in the simplest way possible. Besides giving the explanation of If a person uses spectacles of power + 1.0 dioptre, what is the nearest distance of distinct vision for him ? Given that near point of the person is 75 cm from the eye.a)-298 cmb)300 cmc)42.86 cmd)+298 cmCorrect answer is option 'C'. Can you explain this answer?, a detailed solution for If a person uses spectacles of power + 1.0 dioptre, what is the nearest distance of distinct vision for him ? Given that near point of the person is 75 cm from the eye.a)-298 cmb)300 cmc)42.86 cmd)+298 cmCorrect answer is option 'C'. Can you explain this answer? has been provided alongside types of If a person uses spectacles of power + 1.0 dioptre, what is the nearest distance of distinct vision for him ? Given that near point of the person is 75 cm from the eye.a)-298 cmb)300 cmc)42.86 cmd)+298 cmCorrect answer is option 'C'. Can you explain this answer? theory, EduRev gives you an ample number of questions to practice If a person uses spectacles of power + 1.0 dioptre, what is the nearest distance of distinct vision for him ? Given that near point of the person is 75 cm from the eye.a)-298 cmb)300 cmc)42.86 cmd)+298 cmCorrect answer is option 'C'. Can you explain this answer? tests, examples and also practice Class 10 tests.
Explore Courses for Class 10 exam

Top Courses for Class 10

Explore Courses
Signup for Free!
Signup to see your scores go up within 7 days! Learn & Practice with 1000+ FREE Notes, Videos & Tests.
10M+ students study on EduRev