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# Important Questions for BE Biotechnology Semester 2 (FE First Year) - University of Mumbai - Applied Physics 2

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Why the Newton’s rings are circular and centre of interference pattern (reflected) is dark?

Appears in 1 question paper
Chapter: [7] Interference and Diffraction of Light
Concept: Newton’S Rings

What is Rayleigh’s criterion of resolution? Define resolving power of grating?

Appears in 1 question paper
Chapter: [7] Interference and Diffraction of Light
Concept: Resolving Power of a Grating

What will be the fringe pattern if wedge shaped air film is illuminated with white light?

Appears in 1 question paper
Chapter: [7] Interference and Diffraction of Light
Concept: Wedge Shaped Film(Angle of Wedge and Thickness Measurement)

Obtain the condition for maxima and minima of the light reflected from a thin transparent film of uniform thickness. Why is the visibility of the fringe much higher in the reflected system than in the transmitted system.

Appears in 1 question paper
Chapter: [7] Interference and Diffraction of Light
Concept: Interference in Thin Film of Constant Thickness Due to Reflected and Transmitted Light

Explain the experimental method to determine the wavelength of spectral lines using grating. A diffraction grating has 5000 lines / cm and the total ruled with is 5cm. Calculate dispersion for a wavelength of 5000 A0 in the second order.

Appears in 1 question paper
Chapter: [7] Interference and Diffraction of Light
Concept: Application of Diffraction > Determination of Wavelength of Light with a Plane Transmission Grating

A wedge shaped air film having angle 40 seconds is illuminated by monochromatic light. Fringes are observed vertically through a microscope. The distance between 10 consecutive dark fringes is 1.2 cm. find the wavelength of monochromatic light used.

Appears in 1 question paper
Chapter: [7] Interference and Diffraction of Light
Concept: Wedge Shaped Film(Angle of Wedge and Thickness Measurement)

Describe in detail the concept of anti-reflecting film with a proper ray diagram.

Appears in 1 question paper
Chapter: [7] Interference and Diffraction of Light
Concept: Anti-reflecting Films and Highly Reflecting Film

Why the Newton’s rings are circular and fringes in wedge shaped film are straight?

Appears in 1 question paper
Chapter: [7] Interference and Diffraction of Light
Concept: Newton’S Rings

What is grating and grating element?

Appears in 1 question paper
Chapter: [7] Interference and Diffraction of Light
Concept: Diffraction Grating

What is meant by thin film? Comment on the colours in thin film in sunlight.

Appears in 1 question paper
Chapter: [7] Interference and Diffraction of Light
Concept: Interference in Thin Film of Constant Thickness Due to Reflected and Transmitted Light

Derive the conditions of maxima and minima due to interference of light transmitted from thin film of uniform thickness.

Appears in 1 question paper
Chapter: [7] Interference and Diffraction of Light
Concept: Interference in Thin Film of Constant Thickness Due to Reflected and Transmitted Light

Explain the experimental method to determine the wavelength of spectral line using diffraction grating.
What is the highest order spectrum which can be seen with monochromatic light of wavelength 6000 Ao by means of a diffraction grating with 5000 lines/cm?

Appears in 1 question paper
Chapter: [7] Interference and Diffraction of Light
Concept: Diffraction Grating

Two optically plane glass strips of length 10 cm are placed one over the other.A thin foil of thickness 0.01 mm is introduced between them at one end to form an air film.
If the light used has wavelength 5900 Ao,find the separation between consecutive bright fringes.

Appears in 1 question paper
Chapter: [7] Interference and Diffraction of Light
Concept: Diffraction of Light

With Newton’s ring experiment explain how to determine the refractive index of liquid.

Appears in 1 question paper
Chapter: [7] Interference and Diffraction of Light
Concept: Newton’S Rings

Explain how interference in wedge shaped film is used to test optical flatness of given glass plate.

Appears in 1 question paper
Chapter: [7] Interference and Diffraction of Light
Concept: Wedge Shaped Film(Angle of Wedge and Thickness Measurement)

What is diffraction grating? What is the advantage of increasing the number of lines in the grating?

Appears in 1 question paper
Chapter: [7] Interference and Diffraction of Light
Concept: Diffraction Grating

In Newtons’s ring experiment,what will be the order of dark ring which will have double the diameter of 40th dark ring?

Appears in 1 question paper
Chapter: [7] Interference and Diffraction of Light
Concept: Newton’S Rings

Derive the conditions of maxima and minima due to interference of light reflected from thin film of uniform thickness.

Appears in 1 question paper
Chapter: [7] Interference and Diffraction of Light
Concept: Interference in Thin Film of Constant Thickness Due to Reflected and Transmitted Light

Discuss the Fraunhoffer diffraction at single slit and obtain the condition for minima.
In plane transmission grating the angle of diffraction for second order principal maxima for wavelength 5 x 10-5 is 35o. Calculate number of lines/cm for this diffraction grating.

Appears in 1 question paper
Chapter: [7] Interference and Diffraction of Light
Concept: Diffraction Grating

A wedged shaped air film having an angle of 40 seconds is illuminated by monochromatic light and fringes are observed vertically through a microscope. The distance measured between consecutive fringes is 0.12 cm. Calculate wavelength of light used.

Appears in 1 question paper
Chapter: [7] Interference and Diffraction of Light
Concept: Wedge Shaped Film(Angle of Wedge and Thickness Measurement)
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