First slide

The lens

Question

A lens which has focal length of 4 cm and refractive index of 1.4 is immersed in a liquid of refractive index 1.6, then the focal length will be

Moderate

A

– 12.8 cm
B

32 cm
C

12.8 cm
D

– 32 cm

Solution

$\frac{f_{l}}{f_{a}} = (\frac{{aμ}_{g} - 1}{{lμ}_{g} - 1}) \Rightarrow \frac{f_{l}}{4} = \frac{(1 .4 - 1)}{\frac{1 .4}{1 .6} - 1} \Rightarrow f_{l} = - 12 .8 cm$

Get Instant Solutions

When in doubt download our app. Now available Google Play Store- Doubts App

Recieve an sms with download link

Doubts App

OR

SCAN ME

Doubts App

Doubts App