0

Guest

Courses New

Why focal length increase or power decreases when lens is immersed in water even when power is directly proportional to refractive index and refractive index in water increase

Why focal length increase or power decreases when lens is immersed in water even when power is directly proportional to refractive index and refractive index in water increase

Grade:12

1 Answers

Umakant biswal
5349 Points
7 years ago
dear rb
According to the Snell's Law 
sinQ1/sinQ2=V1/V2
in figure Q1,Q2,V1 and V2 are angles and velocity of light respectively.. 
Lens in air
the refractive index is 1.5. 
In your case:
lens is immersed in water.
straight light ray pass from glass to water at the right side of lens the refractive index for water and glass system is 
velocity of light in water/velocity of light in glass
2.255*10^8/2*10^8=1.1275
more the refractive index more the light beam bend away from normal while travelling from high density medium to low density medium and hence focal length is less.
refractive index for lens immersed in water is less than that of lens in air, so according to the refractive index value focal length will shift.
in case 2 focal length is more than case 1.
HOPE IT CLEARS NOW 
REGARDS 

 

Think You Can Provide A Better Answer ?

Other Related Questions on Inorganic Chemistry

View all Questions »

ASK QUESTION

Get your questions answered by the expert for free

Answer and earn gift vouchers

Win Gift vouchers upto Rs 500/-

View courses by askIITians

Design classes One-on-One in your own way with Top IITians/Medical Professionals

Click Here Know More

Complete Self Study Package designed by Industry Leading Experts

Click Here Know More

Live 1-1 coding classes to unleash the Creator in your Child

Click Here Know More

a Complete All-in-One Study package Fully Loaded inside a Tablet!

Click Here Know More