Physics-
General
Easy
Question
A beam with wavelength l falls on a stack of partially reflecting planes with separation d. The angle 
that the beam should make with the planes so that the beams reflected from successive planes may interfere constructively is (where n =1, 2, ……)
The correct answer is:
Related Questions to study
physics-
Two ideal slits 
and 
are at a distance d apart and illuminated by light of wavelength 
passing through an ideal source slit S placed on the line through as shown. The distance between the planes of slits and the source slit is D. A screen is held at a distance D from the plane of the slits. The minimum value of d for which there is darkness at O is
Two ideal slits and are at a distance d apart and illuminated by light of wavelength passing through an ideal source slit S placed on the line through as shown. The distance between the planes of slits and the source slit is D. A screen is held at a distance D from the plane of the slits. The minimum value of d for which there is darkness at O is
physics-General
physics-
A monochromatic beam of light falls on YDSE apparatus at some angle (say ) as shown in figure. A thin sheet of glass is inserted in front of the lower slit 
. The central bright fringe (path difference = 0) will be obtained
A monochromatic beam of light falls on YDSE apparatus at some angle (say ) as shown in figure. A thin sheet of glass is inserted in front of the lower slit . The central bright fringe (path difference = 0) will be obtained
physics-General
maths-
Find the sum of the infinite series 
Find the sum of the infinite series
maths-General
physics-
In the figure is shown Young’s double slit experiment. Q is the position of the first bright fringe on the right side of O. P is the 11th fringe on the other side, as measured from Q. If the wavelength of the light used is 
, then 
will be equal to
In the figure is shown Young’s double slit experiment. Q is the position of the first bright fringe on the right side of O. P is the 11th fringe on the other side, as measured from Q. If the wavelength of the light used is , then will be equal to
physics-General
physics-
Figure here shows P and Q as two equally intense coherent sources emitting radiations of wavelength 20 m. The separation PQ is 5.0 m and phase of P is ahead of the phase of Q by 
. A, B and C are three distant points of observation equidistant from the mid-point of PQ. The intensity of radiations at A, B, C will bear the ratio
Figure here shows P and Q as two equally intense coherent sources emitting radiations of wavelength 20 m. The separation PQ is 5.0 m and phase of P is ahead of the phase of Q by . A, B and C are three distant points of observation equidistant from the mid-point of PQ. The intensity of radiations at A, B, C will bear the ratio
physics-General
physics-
In an interference arrangement similar to Young's double slit experiment, the slits 
are illuminated with coherent microwave sources each of frequency 
. The sources are synchronized to have zero phase difference. The slits are separated by distance d = 150 m. The intensity I
is measured as a function of , where is defined as shown. If I0 is maximum intensity, then 
for 
is given by
In an interference arrangement similar to Young's double slit experiment, the slits are illuminated with coherent microwave sources each of frequency . The sources are synchronized to have zero phase difference. The slits are separated by distance d = 150 m. The intensity I is measured as a function of , where is defined as shown. If I0 is maximum intensity, then for is given by
physics-General
physics-
In the adjacent diagram, CP represents a wavefront and AO & BP, the corresponding two rays. Find the condition on 
for constructive interference at P between the ray BP and reflected ray OP
In the adjacent diagram, CP represents a wavefront and AO & BP, the corresponding two rays. Find the condition on for constructive interference at P between the ray BP and reflected ray OP
physics-General
physics-
A thin slice is cut out of a glass cylinder along a plane parallel to its axis. The slice is placed on a flat glass plate as shown. The observed interference fringes from this combination shall be
A thin slice is cut out of a glass cylinder along a plane parallel to its axis. The slice is placed on a flat glass plate as shown. The observed interference fringes from this combination shall be
physics-General
physics-
A ray of light of intensity I is incident on a parallel glass-slab at a point A as shown in fig. It undergoes partial reflection and refraction. At each reflection 25% of incident energy is reflected. The rays AB and AB undergo interference. The ratio 
is
A ray of light of intensity I is incident on a parallel glass-slab at a point A as shown in fig. It undergoes partial reflection and refraction. At each reflection 25% of incident energy is reflected. The rays AB and AB undergo interference. The ratio is
physics-General
maths-
If X and Y are two independent variables with means 5 and 10 and variances 4 and 9 respectively. If 
, then r (U, V) is equal to-
If X and Y are two independent variables with means 5 and 10 and variances 4 and 9 respectively. If , then r (U, V) is equal to-
maths-General
chemistry-
For the reaction 
If 1 mol of 
,then the value of in the reaction is
For the reaction If 1 mol of ,then the value of in the reaction is
chemistry-General
physics-
Light wave is travelling along y-direction. If the corresponding 
vector at any time is along the x-axis, the direction of 
vector at that time is along
Light wave is travelling along y-direction. If the corresponding vector at any time is along the x-axis, the direction of vector at that time is along
physics-General
physics-
The intensity of gamma radiation from a given source is I. On passing through 36 mm of lead, it is reduced to 
. The thickness of lead which will reduce the intensity to 
will be
The intensity of gamma radiation from a given source is I. On passing through 36 mm of lead, it is reduced to . The thickness of lead which will reduce the intensity to will be
physics-General
Maths-
If 
, then the value of 
is-
If , then the value of is-
Maths-General
chemistry-
An organic Compound 
forms a precipitate with Tollens and Fehling’s regents. (A) has an isomer (B) . (B) reacts with 1 mol of 
to form 1, 4 dibromo-2-butene. (A) and (B) are:
An organic Compound forms a precipitate with Tollens and Fehling’s regents. (A) has an isomer (B) . (B) reacts with 1 mol of to form 1, 4 dibromo-2-butene. (A) and (B) are:
chemistry-General
