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Syllabus

how does the angle of minimum deviation of glass prism vary if the incident violet light is replaced by red light???

to 6000 Å and the angular width of the central maxima in the resulting diffraction pattern is

measured. When the slit is next illuminated by light of wavelength λ’, the angular width

decreases by 30%. Calculate the value of the wavelength λ’.

what is the difference between polariser and analyser?

State one feature by which the phenomenon of interference can be distinguished from that of diffraction.

A parallel beam of light of wavelength 600 nm is incident normally on a slit of width ‘

a’. If the distance between the slits and the screen is 0.8 m and the distance of 2^{nd}order maximum from the centre of the screen is 15 mm, calculate the width of the slit.Difference between interference and diffraction: Interference is due to superposition of two distinct waves coming from two coherent sources. Diffraction is produced as a result of superposition of the secondary wavelets coming from different parts of the same wavefront.

Numerical: Here, λ = 600 nm = 600 × 10

^{−19}= 6 × 10^{−7}mD= 0.8 m,x= 15 mm = 1.5 × 10^{−3}m,n= 2,a= ?state the conditions for sustained interference of light.

Draw reflected wavefront when a plane wavefront is incident on concave mirror, convex mirror, concave lens and convex lens.

y-coordinate of the point where the total phase difference between the interfering waves is zero, is(A)

y= 0 (B) $y=+\frac{3}{4}\mathrm{m}$ (C) $\mathrm{y}=-\frac{3}{4}\mathrm{m}$ (D) $-\frac{1}{\sqrt{3}}\mathrm{m}$What is Fresnel distance? derive an expression for it.

explain the Huygens principle with example?

What is the effect on the interference pattern observed in a young's double slit experiment in the following cases when:(i) screen is moved away from the plane of the slits.(ii) seperation between the slits is increased.(iii) width of the slits are doubled.Give reasons for your ans....why are coherent sources required to produce the interference of light.

the intensity at the central maxima (o) in a young's double slit experiment is I

_{o}. If the distance OP equals 1/3rd of the fringe width of the pattern , show that the intensity at a point would be I_{0}/4.in the experiment on diffraction due to single slit show that

I) The intensity of diffraction fringes decreases as the order n increases

ii) angular width of the central maximum is twice that of the firdt order secondary maximum

in young's double slit experiment ,the slits are separated by 0.24mm.The screen is 1.2m away from the slits .the fringe width is 0.3 cm.find the wavelength of light used.

ans is 6000 amstrong

what is the relation between polarising angle and critical angle

In a Young's double slit experiment the intensity at the cetral maxima is I_{0}. Find the intensity at a distanceB(beta)/4 from the central maxima where B(beta) is the fringe width.ii) Write two basic features which distinguish the interference pattern from those seen in a coherently illuminated single slit

also write the formula for limit of resolution for a telescope and a microscope.

what is the difference between scattering and diffraction?

An experimental set up similar to young's double slit experiment to observe the interference of light.

Here SS

_{2 }- SS_{1}= lambda/4write down the conditions for

(1)constructive interfernece

(2) destructive interference in terms of path difference S

_{2}p - S_{1}P = deltaDoes the central fringe observed in the above set up lie above or below O . Give reason

why cant two identical and independent sodium lamps act as coherent sources?

explian young's modulus by searle's method..

which of the following waves can be polarised.(i) heat waves (ii) sound wave?and why.

Q35. Due to effect of interference, floating oil layer water is visible coloured, due to observation of the event the thickness of oil layer should be :

(1) 10 nm (2) 0.1 $\mathrm{\mu}$m (3) 1 mm (4) 10 mm

In a double slit interference experiment, the two coherent beams have slightly different intensity

IandI+delta*I(delta*I).Show that the resultant intensity at the maxima is nearly

4Iwhile that at the minima is nealy |delta*I|^{2}/4I.(1)screen is moved away from the plane of the slits.

(2)the monochromatic source is replaced by another monochromatic source of shorter wavelength

(3) the monochromatic source is replaced by another monochromatic source of longer wavelength

(4)slit width is increased.

(5)monochromatic light is replaced by white light.

Two polariods P1 and P2 are placed with their pass axes perpendicular to each other. Unpolarised light of intensity I

_{o }is incident on P1. A third polaroid P3 is kept in between P1 and P2 such that its pass axis makes an angle 45^{0 }with that of P1. determine the intensity of light transmitted though P1, P2 and P3.A parallel beam of monochromatic light falls normally on a narrow slit and the light coming out of the slit is obtained on a screen kept behind parallel to the slit plane.

what kind of pattern do we observe on the screen and why?how does the (i)angular width (ii)linear width of the principal maximum in this pattern changes and the screen is moved ,parallel to itself,away from the slit plane?state two pointsof diffeerence b/w this pattern and the interference pattern observed in the young'double slit experiment .

When

monochromatic lightis incident on a surface separating two media, thereflected & refractedlight both hav thesame frequencyas theincident frequency.Cud u explain in detail'why'?Compare and constrast the pattern which is seen with two coherently illuminated narrow slits in Youngs experiment with that seen for a coherently illuminated single slit producing defraction.

Draw a graph showing the variation of intensity of polarised light transmitted by an analyser.

Plz...give the answers fast sir!!!

Draw a graph showing the variation of intensity with angle in a single slit diffraction experiment.

A light bulb and an open coil inductor are connected in series to an A.C source through a key .The Key is closed and after sometime iron rod is inserted into the interior of inducror . The glow of light bulb...(a)Increase (b) Decreases (c) Uncharged

WHEN rod is inserted what will be your answer if ac is replaced by dc .How the glow of bulb of change if the no of turns of coil is reduced.

UsingHuygen's principledraw a diagram to show how a plane wave front incident at the interface of the two media gets refracted when it propagates from a rarer to a denser medium. Hence verify Snell’s law of refraction.(a)In a single slit diffraction experiment, the width of the slit is made double the original width. How does this affect the size and intensity of the central diffraction band?(b)In what way is diffraction from each slit related to the interference pattern in a double-slit experiment?(c)When a tiny circular obstacle is placed in the path of light from a distant source, a bright spot is seen at the centre of the shadow of the obstacle. Explain why?(d)Two students are separated by a 7 m partition wall in a room 10 m high. If both light and sound waves can bend around obstacles, how is it that the students are unable to see each other even though they can converse easily.(e)Ray optics is based on the assumption that light travels in a straight line. Diffraction effects (observed when light propagates through small apertures/slits or around small obstacles) disprove this assumption. Yet the ray optics assumption is so commonly used in understanding location and several other properties of images in optical instruments. What is the justification?.A beam of light consisting of two wavelengths, 800nm and 600nm is used to obtain the interference fringes in Young's double slit experiment on a screen placed 1.4m away. If the two slits are separated by 0.28mm, calculate the least distance from the central bright maximum where the bright fringes of the two wavelength coincide??

What Are The Assumption Of

?Huygen's Principlename the exp which shows the wave nature of an electron? which phenomenon was observed in this exp using electron beam.?

^{-3}m longwhat is meaning of geometrical shadow???

b)Show that the angular width of the first diffraction fringe is half that of the central fringe

c)Explain why the maxima at centre becomes weaker and weaker with increasing 'n' in case of diffraction

What is the shape of the wavefront in each of the following cases:

(a)Light diverging from a point source.(b)Light emerging out of a convex lens when a point source is placed at its focus.(c)The portion of the wavefront of light from a distant star intercepted by the Earth.Two radio frequency point sources separated by 2.0m are radiating in phase with wavelength 0.5m.A detector moves in a circular path around the two sources in a plane containing them.find how many maxima it detects?

_{0}then the resultant intensity at point 'O' will be-(A) Zero (B) $2{\mathrm{I}}_{0}\left(1+\mathrm{cos}\frac{40\mathrm{\pi}}{9}\right)$ (C) 3â€‹I

_{0 }(D)_{ }I_{0}Show that the angular width of the first diffraction fringe is half that of the central fringe.

Diffraction defines the limit of ray optics.give explanations? - 3 marks

plz answer this question :- In a double slit diffraction arrangement , what should be the width of each slit to obtain 10 maxima of double slit pattern within the central maximum of the single slit pattern ? [ two slits are made 1mm apart ]

PLZ DERIVE THE EXPRESSION OF ANGULAR FRINGE WIDTH............

two independent light sources cannot act as coherent sources.why?

Two polaroids are placed with their optiic axis perpendicular to each other. One of them is rotated through 45 degrees then what is the intensity of light emerging from the second polaroid if I

_{o}is the intensity of the unpolarised light?State Huygens Principle ??? Derive laws of reflection and refraction using it ...

in single slit experiment explain clearly why the secondary maxima become weaker with increasing order (n) of secondary

maxima?

what is central maximum?

What is interference of light? Write two essential conditions for sustained interference pattern to be produced on the screen.Draw a graph showing the variation of intensity versus the position on the screen in Young’s experiment when (a) both the slits are opened and (b) one of the slits is closed.

What is the effect on the interference pattern in Young’s double slit experiment when:

(i) Screen is moved closer to the plane of slits?

(ii) Separation between two slits is increased. Explain your answer in each case.

why is sonometer box hollow from inside?

Solve this:Use Huygens' geometrical construction to show the behaviour of a plane wavefront,

(a) Passing through a biconvex lens

(b) Reflected by a concave mirror.

What is the expression for the angular width of the central maximum in single slit diffraction? How to derive it?

how does the fringe width of interference fringes change,when thw whole apparatus of Young's experiment is kept in liquid of refractive index 1.33??

wht is locus??wht a wave front actually is?

what is pass axis of af a polaroid ?

The fringe width in Young's experiment, when the separation between the slits is 0.5mm and the distance of the screen from the slits is 1.5m, is 1.8mm. Find the path difference between the interfering waves at the position of the first order maximum

what does it mean by path difference and phase difference plz explain me in detail

^{–7}m, it is found that in a thin film of air, 9 fringes occur between two points. Deduce the difference of film thickness between these points.In young's double slit experiment the two slits 0.15mm apart are illuminated by monochromatic light of wavelength 450nm. The screen is 1m away from the slits. Find the distance of the second

a) bright fringe

b) dark fringe from central maximum

ExplAIN THE BAnD THeORy OF SOLIDS IN EaSY LANGUagE...y-coordinate of the nearest maxima above 'O' will be-(A) $\frac{150}{\sqrt{154}}\mathrm{cm}$ (B) 24 cm (C) $\frac{100}{\sqrt{99}}\mathrm{cm}$ (D) None of these