Question

In a single slit experiment, the central maximum is: The same size as all of the...

In a single slit experiment, the central maximum is: The same size as all of the other maximums. Twice the size of the other maximums. Half the size of the other maximums. Just slightly larger than the other maximums.

In a double slit experiment, what happens when the wavelength increases, assuming all other variables remain constant?

The number of constructive and destructive interference lines increases.

The number of constructive and destructive interference lines decreases.

The number of constructive and destructive interference lines stays the same.

The constructive and destructive interference lines fade.

Which of the following factors determine the type of interference seen on thin films:

The indexes of refraction of the mediums involved.

The wavelength of light.

The thickness of the film.

All of the options are true.

Light incident on a polarizer analyser combination allows 15.0% of the incident light to pass through. The angle between their axes is:

56.8o

67.2o

54.8o

81o
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Answer #1

1. In a double slit experiment, what happens when the wavelength increases, assuming all other variables remain constant?

The number of constructive and destructive interference lines stays the same.

Option (C) : it will be correct.

2. Which of the following factors determine the type of interference seen on thin films :

All of the options are true.

Option (D) : it will be correct.

Explanation : For non-reflective coatings, the minimum film thickness required is -

t = coating / 4n

where, n = index of refraction of the coating material

To obtain a nice colored pattern, the thickness of a film has to be on the order of wavelength of light.

3. The angle between their axes will be given by -

using a formula, we have

I = I0 cos2

(0.15) I0 = I0 cos2

(0.15) = cos2

squaring on both sides & we get

cos = 0.15

= cos-1 (0.3872)

= 67.2 degree

Option (B) : it will be correct.

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