First slide

The lens

Question

A thin convex lens of refractive index 1.5 has a focal length of 15 cm in air. When the lens is placed in liquid of refractive index $\frac{4}{3}$ , its focal length will be

Moderate

A

15 cm
B

10 cm
C

30 cm
D

60 cm

Solution

$\frac{f_{l}}{f_{a}} = \frac{(_{a} μ_{g} - 1)}{(_{l} μ_{g} - 1)} \Rightarrow \frac{f_{l}}{15} = \frac{(1 .5 - 1)}{(\frac{1 .5}{4 / 3} - 1)} \Rightarrow f_{l} = 58.6 cm$

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