First slide

The optical instruments

Question

If the tube length of astronomical telescope is 105cm and magnifying power is 20 for normal setting, calculate the focal length of the objective lens

Easy

A

100 cm
B

10 cm
C

20 cm
D

25 cm

Solution

$L = f_{0} + f_{e} = 105 c m a n d M = \frac{f_{0}}{f_{e}} = 20 \Rightarrow f_{0} = 100 c m a n d f_{e} = 5 c m$

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