Got Homework?
Connect with other students for help. It's a free community.
Here's the question you clicked on:
 0 viewing
A converging lens has a focal length in air = 20 cm.When it is immersed in a liquid of refractive index less than the refractive index of the material of
the lens the focal length of lens in liquid
a =20cm
b >20cm
c <20cm
d change the sign
 one year ago
 one year ago
A converging lens has a focal length in air = 20 cm.When it is immersed in a liquid of refractive index less than the refractive index of the material of the lens the focal length of lens in liquid a =20cm b >20cm c <20cm d change the sign
 one year ago
 one year ago

This Question is Closed

AvengerVirusBest ResponseYou've already chosen the best response.1
i knew it's b but i can't explain good could u tell me why it is b ?
 one year ago

rajathsbhatBest ResponseYou've already chosen the best response.2
sure. good job though.
 one year ago

rajathsbhatBest ResponseYou've already chosen the best response.2
you see, in situations like this, you must look at something called 'relative refractive index'. relative refractive index n=n(glass)/n(water). Now you know that this 'n' in this situation is less than n(glass). Coming to the second part of determining the focus, you know that lesser the 'n', greater is the focal length right? So, the arrangement we have now will give you the exact same result as would a lens of refractive index n=n(glass)/n(water) placed in air. You know what I mean? Since this refractive index is less than the original refractive index, the focus length will be greater.
 one year ago

AvengerVirusBest ResponseYou've already chosen the best response.1
thanks that really explains good
 one year ago

AvengerVirusBest ResponseYou've already chosen the best response.1
do u know much in ray and light optics ?
 one year ago

rajathsbhatBest ResponseYou've already chosen the best response.2
i good at high school optics, yeah.
 one year ago

AvengerVirusBest ResponseYou've already chosen the best response.1
ok i have many problem but i give myself chance to solve alone so can i revise my questions with later ?
 one year ago

rajathsbhatBest ResponseYou've already chosen the best response.2
sure. Just mention me in your question & I'll be there :)
 one year ago

AvengerVirusBest ResponseYou've already chosen the best response.1
ok thanks again :)
 one year ago
See more questions >>>
Your question is ready. Sign up for free to start getting answers.
spraguer
(Moderator)
5
→ View Detailed Profile
is replying to Can someone tell me what button the professor is hitting...
23
 Teamwork 19 Teammate
 Problem Solving 19 Hero
 Engagement 19 Mad Hatter
 You have blocked this person.
 ✔ You're a fan Checking fan status...
Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.