SATHEE: Optics 2 Question 19

Optics 2 Question 19

19. A ray of light travelling in a transparent medium falls on a surface separating the medium from air at an angle of incidence $45^{\circ}$ . The ray undergoes total internal reflection. If $n$ is the refractive index of the medium with respect to air, select the possible value (s) of $n$ from the following

(1998, 2M)

(a) 1.3

(b) 1.4

(d) 1.6

Show Answer

Answer:

Correct Answer: 19. (c, d)

Solution:

For total internal reflection to take place Angle of incidence, $i >$ critical angle, $θ_{c}$

or $\sin i > \sin θ_{c}$ or $\sin 45^{\circ} > 1 / n$

or $\frac{1}{\sqrt{2}} > \frac{1}{n}$ or $n > \sqrt{2}$ or $n > 1.414$

Therefore, possible values of $n$ can be 1.5 or 1.6 in the given options.

Play Store

App Store

Ask SATHEE

Welcome to SATHEE !
Select from 'Menu' to explore our services, or ask SATHEE to get started. Let's embark on this journey of growth together! 🌐📚🚀🎓

I'm relatively new and can sometimes make mistakes.
If you notice any error, such as an incorrect solution, please use the thumbs down icon to aid my learning.
To begin your journey now, click on "I understand".

Optics 2 Question 19

19. A ray of light travelling in a transparent medium falls on a surface separating the medium from air at an angle of incidence 45∘. The ray undergoes total internal reflection. If n is the refractive index of the medium with respect to air, select the possible value (s) of n from the following

Answer:

Engineering Preparation

Medical Preparation

NCERT Books & Solutions

Important Resources

Other Resources

Syllabus

Test Platform

Sample Mock Test

Mentorship

NCERT Exercise Video Solution

Menu