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$Physics Chapter: Thin Film Interference & Diffraction$

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Physics Chapter: Thin Film Interference & Diffraction

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Questions and Answers

What is the result when the thickness of a thin film is an odd multiple of one quarter-wavelength of light?

The reflected waves reinforce each other.

The light is transmitted with enhanced intensity.

The reflected waves cancel each other. (correct)

The light is completely reflected.

How does thin film interference contribute to the colors seen in soap bubbles?

By allowing all colors to pass through without change.

By reflecting light only at specific angles.

By absorbing certain colors and reflecting others.

By reinforcing and attenuating specific wavelengths of light. (correct)

What role does the refractive index of a thin film play in thin film interference?

It must be higher than the refractive indices of the materials above and below.

It must be equal to the refractive index of the surrounding medium.

It should be less than both adjacent materials' refractive indices.

It should value between the two surrounding indices. (correct)

What happens to the interference pattern when the thickness of the film is much larger than the coherence length of the incident light?

The interference pattern is washed out. Signup and view all the answers

What is the primary cause of diffraction as light passes through a narrow slit?

The inability of light to travel in straight lines. Signup and view all the answers

For appreciable diffraction to occur, what must the slit width be in relation to the wavelength of light?

It must be considerably smaller than the wavelength. Signup and view all the answers

When light passes through a slit that is much smaller than its wavelength, what happens to the emitted light?

It spreads out like spherical waves. Signup and view all the answers

Which statement correctly describes the behavior of reflected and refracted waves at the boundaries of a thin film?

Reflected waves are inverted, refracted waves are not. Signup and view all the answers

Study Notes

Thin Film Interference

Multicolored patterns (oil slicks, soap bubbles) are examples of thin film interference
Light waves reflected from upper and lower boundaries of a thin film interfere
If film thickness is an odd multiple of 1/4 wavelength, reflected waves cancel
If film thickness is a multiple of 1/2 wavelength, reflected waves reinforce
This affects which wavelengths are intensified (colors) or attenuated
Antireflection coatings on lenses use this principle

Diffraction of Light

Light spreading outwards from a narrow slit is diffraction
This is explained by treating light as a wave
Slit width and wavelength affect diffraction
Narrow slits behave like point sources
Diffraction occurs when slit width is smaller than the wavelength

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Description

This quiz covers key concepts from the physics of thin film interference and diffraction of light. You will explore the role of wavelength, film thickness, and slit width in these phenomena. Test your understanding of how these principles are applied in real-world situations, like antireflection coatings and oil slicks.