1

JEE Main 2020 (Online) 5th September Evening Slot

MCQ (Single Correct Answer)

+4

-1

Two coherent sources of sound, S

when he is 2 m away from S

_{1}and S_{2}, produce sound waves of the same wavelength, $$\lambda $$ = 1 m, in phase. S_{1}and S_{2}are placed 1.5 m apart (see fig). A listener, located at L, directly in front of S_{2}finds that the intensity is at a minimumwhen he is 2 m away from S

_{2}. The listener moves away from S_{1}, keeping his distance from S_{2}fixed. The adjacent maximum of intensity is observed when the listener is at a distance d from S_{1}. Then, d is :2

JEE Main 2020 (Online) 4th September Morning Slot

MCQ (Single Correct Answer)

+4

-1

A beam of plane polarised light of large

cross-sectional area and uniform intensity

of 3.3 Wm

polariser (cross sectional area 3 $$ \times $$ 10

rotates about its axis with an angular speed

of 31.4 rad/s. The energy of light passing through

the polariser per revolution, is close to :

cross-sectional area and uniform intensity

of 3.3 Wm

^{-2}falls normally on apolariser (cross sectional area 3 $$ \times $$ 10

^{-4}m^{2}) whichrotates about its axis with an angular speed

of 31.4 rad/s. The energy of light passing through

the polariser per revolution, is close to :

3

JEE Main 2020 (Online) 3rd September Evening Slot

MCQ (Single Correct Answer)

+4

-1

Two light waves having the same wavelength $$\lambda $$ in vacuum are in phase initially. Then the first wave
travels a path L

_{1}through a medium of refractive index n_{1}while the second wave travels a path of length L_{2}through a medium of refractive index n_{2}. After this the phase difference between the two waves is :4

JEE Main 2020 (Online) 3rd September Morning Slot

MCQ (Single Correct Answer)

+4

-1

In a Young’s double slit experiment, light of
500 nm is used to produce an interference
pattern. When the distance between the slits
is 0.05 mm, the angular width (in degree) of
the fringes formed on the distance screen is
close to

Questions Asked from Wave Optics (MCQ (Single Correct Answer))

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