
When an unpolarized light of intensity I is incident on a polarizing sheet, the intensity of the light which is not transmitted is?
A. ${I_0}/2$
B. ${I_0}/4$
C. $zero$
D. ${I_0}$
Answer
532.5k+ views
Hint: In this question think of the basic phenomena of transmission of unpolarized light (that has oscillations in both the directions) through a polarization filter, after passing through this the oscillations get reduced to single sided only. This will help commenting upon the intensity of the light which is not transmitted.
Complete Step-by-Step solution:
Polarized Light -
Light is formed by a combination of electromagnetic rays. It consists of both the electric and magnetic fields oscillating at 90 Degrees to each other.
The light waves propagate at a perpendicular angle to the oscillations of electric and magnetic fields.
When oscillations take place in a single direction, we call it Polarized light.
Unpolarized Light -
When oscillations take place in a random direction & not in a single one, we call such rays as unpolarized light. For example, Sun rays or rays emitted by a lamp can be defined as unpolarized light.
Unpolarized to polarized light -
An unpolarized light can be converted into polarized light, simply, by passing the rays through the polarization filter.
In polarization filters, organic molecules in the form of long chains are arranged parallel to each other. When an unpolarized light is passed through these filters, the rays which are arranged parallel to these molecules, get absorbed & thus the light rays that come out of the filter have oscillations in one direction only, making them Polarized Light. Now, since the number of rays in polarized light are reduced to half to that of unpolarized light, the answer to this question will be ${I_0}/2$
In other terms, when an unpolarized light is passed through a polarizing sheet, the intensity of the light that is not transferred is half.
Note - The trick to solving these questions lies in knowing that polarizing sheets have chains of organic molecules arranged parallel to each other. Moreover, in an unpolarized light, oscillations of light waves are random in direction. Thus, when an unpolarized light is converted to polarized light, the intensity of light gets reduced.
Complete Step-by-Step solution:
Polarized Light -
Light is formed by a combination of electromagnetic rays. It consists of both the electric and magnetic fields oscillating at 90 Degrees to each other.
The light waves propagate at a perpendicular angle to the oscillations of electric and magnetic fields.
When oscillations take place in a single direction, we call it Polarized light.
Unpolarized Light -
When oscillations take place in a random direction & not in a single one, we call such rays as unpolarized light. For example, Sun rays or rays emitted by a lamp can be defined as unpolarized light.
Unpolarized to polarized light -
An unpolarized light can be converted into polarized light, simply, by passing the rays through the polarization filter.
In polarization filters, organic molecules in the form of long chains are arranged parallel to each other. When an unpolarized light is passed through these filters, the rays which are arranged parallel to these molecules, get absorbed & thus the light rays that come out of the filter have oscillations in one direction only, making them Polarized Light. Now, since the number of rays in polarized light are reduced to half to that of unpolarized light, the answer to this question will be ${I_0}/2$
In other terms, when an unpolarized light is passed through a polarizing sheet, the intensity of the light that is not transferred is half.
Note - The trick to solving these questions lies in knowing that polarizing sheets have chains of organic molecules arranged parallel to each other. Moreover, in an unpolarized light, oscillations of light waves are random in direction. Thus, when an unpolarized light is converted to polarized light, the intensity of light gets reduced.
Recently Updated Pages
Master Class 11 Economics: Engaging Questions & Answers for Success

Master Class 11 English: Engaging Questions & Answers for Success

Master Class 11 Social Science: Engaging Questions & Answers for Success

Master Class 11 Biology: Engaging Questions & Answers for Success

Class 11 Question and Answer - Your Ultimate Solutions Guide

Master Class 12 Economics: Engaging Questions & Answers for Success

Trending doubts
Which one is a true fish A Jellyfish B Starfish C Dogfish class 10 biology CBSE

The Equation xxx + 2 is Satisfied when x is Equal to Class 10 Maths

Why is there a time difference of about 5 hours between class 10 social science CBSE

Fill the blanks with proper collective nouns 1 A of class 10 english CBSE

When and how did Canada eventually gain its independence class 10 social science CBSE

What is the median of the first 10 natural numbers class 10 maths CBSE
