Wave Optics Test

Result

Wave Optics Test - 16

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Weekly Quiz Competition

Question 1
4 / -1

In the ideal double slit experiment, when a glass plate of refractive index 1.5 and thickness t is introduced in the path of one of the interfering beams of wavelength λ, the intensity at the position of central max. remains unchanged . Minimum thickness of glass plate is

A
2 λ

B
2 λ/3

C
λ/3

D
λλ

Solution
Question 2
4 / -1

An astronaut is looking down on earth’s surface from a space shuttle at an altitude of 500 km. Assuming that the astronaut’s pupils’ diameter 5 mm and the wavelength of visible light is 500 nm, the astronaut will be able to resolve linear objects of the size of about

A
0.5 m

B
5 m

C
50 m

D
500m

Solution
Question 3
4 / -1

When an unpolarized light of intensity I₀ is incident on a polarizing sheet, the intensity of the light which does not get transmitted is

A
I₀

B
zero

C

D

Solution
Question 4
4 / -1

In Young’s double slit experiment, intensity at a point is (1/4) of the maximum intensity Angular position of this point is

A
sin^-1 (λ/d)

B
sin^-1 (λ/2d)

C
sin^-1 (λ/3d)

D
sin^-1 (λ/4d)

Solution
Question 5
4 / -1

A beam of electron is used in a YDSE experiment. The slit width is d .When the velocity of electron is increased,then

A
no interference is observed

B
fringe width increases

C
fringe width decreases

D
fringe width remains same
Question 6
4 / -1

In case of linearly polarised light, the magnitude of electric field vector

A
does not change with time

B
varies periodically with time

C
increases and decreases linearly with time

D
is parallel to the direction of propagation
Question 7
4 / -1

When the angle of incidence on a material is 60^o, the reflected light is completely polarized. The velocity of the refracted ray inside the material in m/s is

A
3 × 10⁸

B

C

D
0.5 × 10⁸

Solution
Question 8
4 / -1

A glass slab of thickness 8 cm contains the same number of waves as 10 cm of water when both are traversed by the same monochromatic light. If the refractive index of water is 4/3, the refractive index of glass is

A
5/4

B
3/2

C
5/3

D
16/15

Solution
Question 9
4 / -1

When an unpolarised light of intensity I₀ is incident on a polarising sheet, the intensity of the light which does not get transmitted is

A

B

C
zero

D
I₀
Question 10
4 / -1

Two coherent point sources S₁ and S₂ are separated by a small distance d as shown in the figure. The fringes obtained on the screen will be

A
points

B
straight lines

C
semi-circle

D
concentric circles