Wave Optics Test

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Wave Optics Test - 14

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Question 1
1 / -0

A plane wave front falls on a convex lens. The emergent wave front is :

A
plane

B
cylindrical

C
spherical diverging

D
spherical converging

Solution

A convex lens is thicker at the middle. When a light ray is incident parallel
to principle axis it is refracted towards the focal point. Similarly when a plane wave front is incident on a convex lens the light is refracted towards a point on the focal plane.
As the light is getting focused at a point it is converging and the emerging wave front is a spherical converging.
Question 2
1 / -0

1: Primary waves can travel in all directions in an ether
2: Secondary waves can travel only in backward in an ether

A
1 is true, 2 is false

B
Both 1 and 2 are true

C
1 is false, 2 is true

D
Both 1 and 2 are false

Solution

Primary wave can travel in all directions in ether.
Secondary waves can travel in forward direction in ether
The wavefronts gradually spread in all the directions. So at every point, we have a wave coming out. The primary wavefront is formed and again from the primary wavefront, a secondary waveform is formed and so on. The disturbance does not last for a long time.
Question 3
1 / -0

Match list A and list B accurately :
List A List B
a) spherical wave front e) linear source
b) plane wave front f) point light source
c) cylindrical wave front g) at infinite distance

A
( a, f ); ( b, g); ( c, e)

B
( a, f ); ( b, e); ( c, g)

C
( a, g ); ( b, f); ( c, e)

D
( a, e ); ( b, g); ( c, f)

Solution

A point light source emits a spherical wave front because a point light source is not selective of any direction and emits equally in all directions. A linear source is made of many point sources. The spherical wave front coming out from these point sources interfere with each other and produce a cylindrical wave front.
when the source is at infinite distance then the wave front as a plane wave front because a plane wave front has infinite radius.
Question 4
1 / -0

A: In interference pattern, intensity of successive fringes due to achromatic light is not same.
R: In interference, only redistribution of energy takes place.

A
Both A and R are true, and R is correct explanation of A

B
Both A and R are true, and R is not correct explanation of A

C
A is true but R is false

D
A is false but R is true

Solution

In Interference, the resultant pattern is determined by the path difference between the two waves. It is same for monochromatic as well as achromatic light. Hence statement A is false. Statement R is true because in interference only redistribution of energy takes place.
Question 5
1 / -0

A wavefront is an imaginary surface where :

A
phase is same for all points

B
phase changes at constant rate at all points along the surface

C
constant phase difference continuously changes between the points

D
phase changes all over the surface
Question 6
1 / -0

In the set up shown, the two slits $$S_{1}$$ and $$S_{2}$$ are not equidistant from the slit S. The central fringe at O is then

A
always bright

B
always dark

C
either dark or bright depending on the position of S

D
neither dark nor bright

Solution

As the two slits $$S_{1}$$ and $$S_{2}$$ are not equidistant from the slit s the distance traversed by light through $$S_{1}$$ and $$S_{2}$$ may not differ by an integral multiple of wavelength. Thus it need not be bright . similarly it need not be dark. Thus option C is correct.
Question 7
1 / -0

When petrol drops from a vehicle fall over rain water on road surface, colours are seen because of:

A
dispersion of light

B
interference of light

C
scattering of light

D
absorption of light

Solution

When a layer of oil falls on water, the light waves reflected by the upper and lower boundaries interfere with one another to produce colours.
Thus the reason is interference of light
Question 8
1 / -0

ASSERTION (A):Hyugens' theory failed to explain polarization
REASON (R): According to Hyugens' theory light is longitudinal wave

A
A is correct, R is correct and it is the correct explanation

B
A is correct, R is correct but it is not a correct explanation

C
A is correct, R is wrong

D
A is wrong , R is correct

Solution

Huygen's theory failed to explain polarisation because according to the Huygen's theory light is a longitudinal waves and longitudinal wave does not shows polarisation.
Question 9
1 / -0

Polarisation of light was first successfully explained by:

A
Corpuscular theory

B
Huygens' wave theory

C
Electromagnetic wave theory

D
Planck's theory

Solution

Electromagnetic wave theory explains light as being composed of electric field vibrating in planes.
Polarisation of light refers to vibrating electric field in a particular plane.
Question 10
1 / -0

Bartholinus discovered :

A
Interference by splitting the wave front

B
Polarisation by reflection

C
Polarisation by refraction

D
Polarisation by double refraction

Solution

In 1669, another Danish scientist, Erasmus Bartholinus discovered the polarization of light by double refraction in Iceland spar (calcite).

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Wave Optics Test - 14

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Wave Optics Test - 14

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SHARING IS CARING

Question 1

plane

cylindrical

spherical diverging

spherical converging

Solution

Question 2

1 is true, 2 is false

Both 1 and 2 are true

1 is false, 2 is true

Both 1 and 2 are false

Solution

Question 3

( a, f ); ( b, g); ( c, e)

( a, f ); ( b, e); ( c, g)

( a, g ); ( b, f); ( c, e)

( a, e ); ( b, g); ( c, f)

Solution

Question 4

Both A and R are true, and R is correct explanation of A

Both A and R are true, and R is not correct explanation of A

A is true but R is false

A is false but R is true

Solution

Question 5

phase is same for all points

phase changes at constant rate at all points along the surface

constant phase difference continuously changes between the points

phase changes all over the surface

Question 6

always bright

always dark

either dark or bright depending on the position of S

neither dark nor bright

Solution

Question 7

dispersion of light

interference of light

scattering of light

absorption of light

Solution

Question 8

A is correct, R is correct and it is the correct explanation

A is correct, R is correct but it is not a correct explanation

A is correct, R is wrong

A is wrong , R is correct

Solution

Question 9

Corpuscular theory

Huygens' wave theory

Electromagnetic wave theory

Planck's theory

Solution

Question 10

Interference by splitting the wave front

Polarisation by reflection

Polarisation by refraction

Polarisation by double refraction

Solution

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