Browse by Stream
QnA
Home
QnA
Go To Your Study Dashboard

Get Answers to all your Questions

header-bg qa

A ray of light travelling in a transpatent medium of refractive index \mu, falls on a surface separating the medium from air at an angle of incidence of 45^{\circ}. For which of the following value of \mu the ray can undergo total internal reflection?

  • Option 1)

    \mu =1.33

  • Option 2)

    \mu=1.40

  • Option 3)

    \mu =1.50

  • Option 4)

    \mu =1.25

 

Answers (1)

best_answer

 

Critical angle -

sin c = Refractive index of rarer medium / Refractive index of denser medium

- wherein

When angle of incidence of a travelling from a dence medium to rarer medium is greater than critical angle, no refraction occurs.

 

 For total internal reflection \theta \geq \theta _{c}

Sin \theta_{c}=\frac{1}{\mu} => \theta_{c}=sin^{-1}(\frac{1}{\mu})

\theta\geq sin^{-1}(\frac{1}{\mu}) or Sin\theta\geq \frac{1}{\mu} or \mu\geq \frac{1}{sin\theta}

\mu\geq \frac{1}{Sin 45}\mu\geq \frac{1}{Sin 45} =\sqrt{2}

Only value satisfy this is \mu=1.50

 


Option 1)

\mu =1.33

This is incorrect answer 

Option 2)

\mu=1.40

This is correct answer 

Option 3)

\mu =1.50

This is incorrect answer 

Option 4)

\mu =1.25

This is incorrect answer 

Posted by

divya.saini

View full answer

NEET 2024 Most scoring concepts

    Just Study 32% of the NEET syllabus and Score up to 100% marks

Similar Questions

Trending Articles/News

anam-khan

Bihar NEET UG 2024 stray vacancy seat allotment result tomorrow; confirm admission till December 29
anam-khan

Bihar NEET UG 2024 special stray vacancy round 3 choice-filling deadline today; allotment on December 27
anam-khan

Bombay HC grants admission to MBBS aspirant in Maharashtra college through supernumerary seat

Latest Question