Wave Optics Test

Result

Wave Optics Test - 5

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Weekly Quiz Competition

Question 1
1 / -0

As a result of interference of two coherent sources of light, energy is :

A
decreased

B
increased

C
redistributed and the distribution does not vary with time

D
redistributed and the distribution changes with time

Solution

In the phenomenon of interference the light energy is redistributed and the distribution does not vary with time.

The correct answer is: redistributed and the distribution does not vary with time
Question 2
1 / -0

Waves that cannot be polarized are :

A
transverse waves

B
longitudinal waves

C
light waves

D
electromagnetic waves

Solution

Longitudinal waves cannot be polarized.

The correct answer is: longitudinal waves
Question 3
1 / -0

Statement-1: Newton’s rings are formed in the reflected system when the space between the lens and the glass plate is filled with a liquid of refractive index greater than that of glass, the central spot of the pattern is bright.

Statement-2: This is because the reflection in these cases will be from a denser to rarer medium and the two interfering rays are reflected under similar conditions.

A
Both Statement-1 and Statement-2 are true and Statement-2 is the correct explanation of Statement-1.

B
Both Statement-1 and Statement-2 are true and Statement-2 is not the correct explanation of Statement-1.

C
Statement-1 is true but Statement-2 is false.

D
Statement-1 is false but Statement-2 is true.

Solution

Newton's rings are formed in reflected system and if the refractive index of the first medium is more than the second medium, there is no reversal of phase in reflected ray so, central fringe remains bright.

The correct answer is: Both Statement-1 and Statement-2 are true and Statement-2 is the correct explanation of Statement-1.
Question 4
1 / -0

Statement-1: Radio waves can be polarized.

Statement-2: Sound waves in air are longitudinal in nature.

A
Both Statement-1 and Statement-2 are true and Statement-2 is the correct explanation of Statement-1.

B
Both Statement-1 and Statement-2 are true and Statement-2 is not the correct explanation of Statement-1.

C
Statement-1 is true but Statement-2 is false.

D
Statement-1 is false but Statement-2 is true.

Solution

Radio waves are electromagnetic waves which are transverse in nature. And thus they can be polarized. Sound wave is a longitudinal wave, which can never be polarized.

The correct answer is: Both Statement-1 and Statement-2 are true and Statement-2 is not the correct explanation of Statement-1.
Question 5
1 / -0

Statement-1: In Young's double slit experiment, the fringe width for dark fringes is equal to that for bright fringes.

Statement-2: In Young's double slit experiment, if the experiment is performed with a source of white light, then only dark and bright fringes are observed.

A
Both Statement-1 and Statement-2 are true and Statement-2 is the correct explanation of Statement-1.

B
Both Statement-1 and Statement-2 are true and Statement-2 is not the correct explanation of Statement-1.

C
Statement-1 is true but Statement-2 is false.

D
Statement-1 is false but Statement-2 is true.

Solution

In Young's double slit experiment, fringe width of dark and bright fringes is equal.

If white light is used then colored fringes are observed

The correct answer is: Statement-1 is true but Statement-2 is false.