© examsnet.com
Question : 9
Total: 26
Use the mirror equation to show that an object placed between f 2 f 2 f
OR
Find an expression for intensity of transmitted light when a polaroid sheet is rotated between two crossed polaroids. In which position of the polaroid sheet will the transmitted intensity be maximum?
OR
Find an expression for intensity of transmitted light when a polaroid sheet is rotated between two crossed polaroids. In which position of the polaroid sheet will the transmitted intensity be maximum?
Solution:
Derivation of the required condition
=
+
For concave mirrorf < 0 u < 0
As object lies betweenf 2 f
(i) Atu = − f
= −
+
⇒ v = ∝
Atu = − 2 f
⇒
= −
+
= −
⇒ v = − 2 f
⇒ v ≥ − 2 f
Since,v
For concave mirror
As object lies between
(i) At
At
Since,
© examsnet.com
Go to Question: