Wave Optics Test

Result

Wave Optics Test - 78

Score
-
out of -
Rank
-
out of -

TIME Taken - -

SHARING IS CARING

If our Website helped you a little, then kindly spread our voice using Social Networks. Spread our word to your readers, friends, teachers, students & all those close ones who deserve to know what you know now.

Weekly Quiz Competition

Question 1
1 / -0

Young's double slit experiment is made in a liquid. The $$10^{th} $$ bright fringe in liquid lies where $$6^{th}$$ dark fringe lies in vacuum. The refractive index of the liquid is approximately

A
$$1.8$$

B
$$1.54$$

C
$$1.67$$

D
$$1.2$$

Solution
Question 2
1 / -0

Find the half angular width of the central bright maximum in the Fraunhofer diffraction pattern of a slit of width $$12\times { 10 }^{ 5 }cm$$ when the slit is illuminated by monochromatic light of wavelength 6000$$\mathring { A } \quad $$.

A
$${ 40 }^{ \circ }$$

B
$${ 45 }^{ \circ }$$

C
$${ 30 }^{ \circ }$$

D
$${ 60 }^{ \circ }$$

Solution
Question 3
1 / -0

Unpolarized light of intensity $$32{\text{W}}{{\text{m}}^{{\text{ - 2}}}}$$ passes through three polarizers such that the transmission axis of the last polarizer is crossed with the first. If the intensity of the emerging light is $$3{\text{W}}{{\text{m}}^{{\text{ - 2}}}}$$, what is the angle between the axes of the first two polarized is.

A
$${45^0}$$

B
$${60^0}$$

C
$${30^0}$$

D
Zero

Solution
Question 4
1 / -0

A ray of light incident mutually on an isosceles right angled prism travels as shown in the figure. The least value of the refractive index of the prison must be

A
$$\sqrt{2}$$

B
$$\sqrt{2}$$

C
1.5

D
2.0

Solution
Question 5
1 / -0

In a Young's double slit experiment using red and blue lights of wavelengths $$600\ mm$$ and $$480\ nm$$ respectively, the value of $$n$$ for which the $$n^{th}$$ red fringe coincides with $$(n + 1)^{th}$$ blue fringe is

A
$$5$$

B
$$4$$

C
$$3$$

D
$$2$$

Solution
Question 6
1 / -0

The intensity of light from a source is 500 / $$\pi W/m^{2}$$. Find the amplitude of electric field in this wave -

A
$$\sqrt{3}\times 10^{2}N/C$$

B
$$2\sqrt{3}\times 10^{2}N/C$$

C
$$\frac{\sqrt{3}}{2}\times 10^{2}N/C$$

D
$$2\sqrt{3}\times 10^{1}N/C$$

Solution
Question 7
1 / -0

A beam of light consisting of two wavelength $$650\ nm$$ and $$520\ nm$$ is used to illuminate the slit of a Young's double slit experiment. Then the order of the bright figure of the longer wavelength that coincide with a bright fringe of the shorter wavelength at the least distance from the central maximum is:-

A
$$1$$

B
$$2$$

C
$$3$$

D
$$4$$

Solution

$$n\beta_{1}=(n+1)\beta_{2}$$

$$\Rightarrow \dfrac{n\times 650\times 10^{-19}D}{d}$$

$$=\dfrac{(n+1)\times 520\times 10^{-19}\times D}{d}$$

$$\Rightarrow n=4$$
Question 8
1 / -0

In Young's double-slit experiment, the phase difference between the two waves reaching the location of the third dark fringe is

A
$$\pi$$

B
$$\dfrac {3\pi}{2}$$

C
$$5\pi$$

D
$$3\pi$$

Solution
Question 9
1 / -0

The intensity of the central fringes obtained in the interference pattern due to two identical slit source is $$I$$. When one of the slits is closed then the intensity at the same points is $$I_{0}$$. Then the correct relation ship between $$I$$ and $$I_{0}$$ is

A
$$I=I_{0}$$

B
$$I=2I_{0}$$

C
$$I=4I_{0}$$

D
$$I=I_{0}/4$$
Question 10
1 / -0

$$\ln Y D S E , d = 2 \mathrm { mm } , D = 2 \mathrm { m }$$ and $$\lambda = 500 \mathrm { nm }$$ . If intensity of two slits are $$l _ { 0 }$$ and 9$$/ _ { 0 }$$ , then find intensity at $$y = \frac { 1 } { 6 } m m$$

A
$$7 I _ { 0 }$$

B
$$10 I _ { 0 }$$

C
$$16 I _ { 0 }$$

D
$$4 I _ { 0 }$$

Solution