Find the acceptance angle of a material which has a numerical aperture of 0.707 in air.(a) 30(b) 60(c) 45(d) 90I got this question in class test.This question is from Refractive Index and Numerical Aperture in division EM Wave Propagation of Electromagnetic Theory

Find the acceptance angle of a material which has a numerical aperture

1.	Find the acceptance angle of a material which has a numerical aperture of 0.707 in air.(a) 30(b) 60(c) 45(d) 90I got this question in class test.This question is from Refractive Index and Numerical Aperture in division EM Wave Propagation of Electromagnetic Theory
Answer» The correct option is (c) 45 Easy explanation: The numerical APERTURE is GIVEN by NA = n SIN θa, where n is the refractive index. It is unity in air. Thus NA = sin θa. To GET θ= sin^-1(NA), put NA = 0.707, thus θa = sin^-1(0.707) = 45 degree.

Discussion

No Comment Found

Related InterviewSolutions

In P polarisation, the electric field lies in the same plane as the interface. State True/False.(a) True(b) FalseI have been asked this question in semester exam.This intriguing question originated from S and P Polarised Waves topic in portion EM Wave Propagation of Electromagnetic Theory
The group delay of a wave with phase constant 2.5 units and frequency of 1.2 radian/sec is(a) 3.7(b) 1.3(c) 3(d) 2.08The question was asked in an international level competition.My doubt is from S and P Polarised Waves topic in chapter EM Wave Propagation of Electromagnetic Theory
Calculate the transmission coefficient of a wave with a reflection coefficient of 0.6(a) 0.6(b) 1(c) 0(d) 0.4The question was posed to me in an online interview.The question is from S and P Polarised Waves in division EM Wave Propagation of Electromagnetic Theory
Find the relative permittivity of the medium having a refractive index of 1.6(a) 0.4(b) 2.56(c) 3.2(d) 4.8This question was posed to me in final exam.My question is based upon S and P Polarised Waves topic in portion EM Wave Propagation of Electromagnetic Theory
The transmission coefficient of a wave with incident and transmitted electric field of 5 and 5 respectively is(a) 0(b) 1(c) 10(d) 5The question was posed to me during an online exam.This intriguing question comes from S and P Polarised Waves topic in section EM Wave Propagation of Electromagnetic Theory
Find the reflection coefficient of a wave with an incident electric field of 5 units and reflected electric field of 2 units.(a) 2.5(b) 0.4(c) 0.8(d) 1.2This question was posed to me in unit test.My question is based upon S and P Polarised Waves in section EM Wave Propagation of Electromagnetic Theory
The Brewster angle is valid for which type of polarisation?(a) S polarised(b) P polarised(c) Elliptical(d) LinearThe question was posed to me in an online interview.The query is from S and P Polarised Waves topic in section EM Wave Propagation of Electromagnetic Theory
In S polarisation, the electric field lies in the plane perpendicular to that of the interface. State True/False(a) True(b) FalseI got this question in final exam.Asked question is from S and P Polarised Waves in portion EM Wave Propagation of Electromagnetic Theory
The resultant electric field of a wave with Ex = 3 and Ey = 4 will be(a) 7(b) 1(c) 25(d) 5This question was addressed to me in a national level competition.My doubt is from S and P Polarised Waves topic in division EM Wave Propagation of Electromagnetic Theory
Identify the polarisation of the wave given that, Ex = 2 sin wt and Ey = 3 sin wt.(a) Linear(b) Elliptical(c) Circular(d) ParallelI had been asked this question in class test.My enquiry is from Types of Polarization topic in portion EM Wave Propagation of Electromagnetic Theory

Find the acceptance angle of a material which has a numerical aperture of 0.707 in air.(a) 30(b) 60(c) 45(d) 90I got this question in class test.This question is from Refractive Index and Numerical Aperture in division EM Wave Propagation of Electromagnetic Theory

Discussion

No Comment Found

Related InterviewSolutions

Reply to Comment