Wave Optics Questions and Answers

Aakash Rank Booster Test Series for NEET 2020 In the figure shown if a parallel beam of white light is incident on the plane of the slits then the distance of the nearest white spot on the screen from O is d A Find the value of A Assume d D 1 3 d2d 3 D 2 5 O

A wave front AB passing through a system C as DE The system C could be emerges A D F B A a slit C a prism C E B a biprism D a glass slab

4 In an isotropic medium the secondary wavelets centred on every point of a given wavefront are all a Spherical b c Oval d of arbitrary shape Cylindrical

A sound of intensity 27 lo is produced at the end A It travels down to the point B along three different paths I II and III as shown in the figure Path II is semi circular At B no sound is heard a Find the maximum possible wavelength of sound b Find the minimum value of x for above wavelength c Find the equations of the three waves arriving at B Assume that sound energy is equally distributed among the three paths The path length III is more than that of II The amplitude of wave corresponding to intensity lo is A The wave velocity is v A 1 0m B

A ray of light is incident at an angle i from denser to rare medium The reflected and the refracted rays are mutually perpendicular The angle of reflection and the angle o refraction are respectively and then the critical angle wil be CBSE PMT 1996 Pb PET 2002 AIIMS 2010 a sin sin r b sin tan r c sin tan i d sin sin i

A long solenoid of diameter 0 1 m has 2 x 104 turns per meter At the centre of the solenoid a 100 turn coil of radius 0 01 m is placed with its axis coinciding with the solenoid axis The current in the solenoid is decreased at a constant rate from 2 A to 2 A in 0 05 sec Find the emf induced in the coil Also find the total charge flowing through the coil during the time when the resistance of the coil is 10 Q

38 A beam of unpolarised light is incident on a tourmaline crystal C The intensity of the emergent light is I and it is incident on another tourmaline crystal C It is found that no light emerges from C If now C is rotated through 45 towards C the intensity of the light emerging from C is In In 310

In Young double slit experiment how many minimas can be obtained on a screen if wavelength of light used is 2000 and slit width is 0 0008 mm 1 6 10 2 7 4 9

7 In Young s double slit experiment shown in figur th S1 and S2 are coherent sources and S is screen having a hole at a point 1 0mm away fro the central line White light 400 to 700nm sent through the slits Which waveleng passing through the hole has strong intensit Tc 0 5mm 400 nm 500 pm S S 50cm Centre of screen hole S Screen 1 0mm b 700 nm d 667pm

6 Light waves of intensities and 9 interfere to produce a fringe pattern on a screen The phase 3 difference between the wave at a point P is 2 and 2 at other point Q Then the ratio of intensities at P and Q is ripil 1 8 5 2 5 8 3 1 4 4 1

Two coherent sources of wavelength 6 2 x 10 7m produce interference The path difference corresponding to dark fringe between third and fourth maxima will be 6 2x 10 7 7 2 17 x 10 m a 4 17 x 10 m 10 6 jo c 6 17 x 10 m d 8 17 x 10 m 2

s answer out of which only ONE OR MORE THAN ONE is are correct Two parallel beams of light P and Q separation d containing radiation of wavelength 4000 and 5000 are incident normally on a prism as shown in figure The refractive index of the prism as a function of wavelength is b given by u 2 1 20 where 2 in and b is a 2 positive constant The value of b is such that the condition for total internal reflection of the face AC is satisfied for one wavelength and not for the other then sin 80 3 0 9856 A The value of b 8 x 10 15 m B Deviation of beam transmitted through face AC is 27 2 C The value of b 4x10 5 m 2 D Deviation of beam transmitted through face AC is 38 7 P A B A sin 0 8

In Fraunhoffer diffraction pattern angular widt of central maximum is a sin c sin 2 d d b 2 sin d sin 4 2 2d

Two speakers are placed as shown in Fig S 1 A B X HS D Mark out the correct statement s 1 If a person is moving along AB he will hear the sound as loud faint loud and so 2 If a person moves along CD he will hear loud faint loud and so on 3 If a person moves along AB he will hear uniform intense sound If a person moves along CD he will hear uniform intense sound

Two metal spheres have radii r and 2r and they emit thermal radiation with maximum intensities at wavelengths and 22 respectively The respective ratio of the radiant energy emitted by them per second will be 3 27 1 1 4 1 3 16 1 Oor 1 2 1 4 4 8 1

4 96 In Fraunhoffer diffraction the centre of diffraction image is Vi 1 always bright 2 always dark 3 sometimes bright and sometimes dark 102 4 bright for large wavelength and dark for low wavelength