Topic 8(ii): Physical Optics

A colorful pattern is observed in a sop bubble. This phenomenon is caused by

• diffraction of light

• diffraction and refraction of light

• diffraction and reflection of light

• reflection and interference of light

Bending of light around the edges of an obstacle is known as:

• Refraction

• Polarization

• Diffraction

• Interference

All of the following conditions can increased the width of central bright obtained in a single slit diffraction EXCEPT

• Change purple light to red light

• increase the width of the slit

• put the screen farther from the slit

• decrease the width of the slit

Which of the following statement regarding single slit diffraction is FALSE ?

• Between each pair of dark fringes there is a bright fringe due to constructive interference.

• The higher order bright fringes are much less intense.

• All waves interfere destructively creates a dark central fringe on the screen directly opposite the slit.

• 3rd minimum dark fringe is corresponding to order number n = 3

Number of bright dots can be seen for light passing through a diffraction grating depends on all of the following EXCEPT

• grating spacing

• wavelength of light used

• number of lines of a grating

• angle of incident

In grating experiment, if white light is used

• Alternate dark and bright fringes will be seen

• Colored fringes will be seen on either side of central bright fringe

• A series of bright fringes will be seen

Which of the following figures represent is a double

slit interference pattern?

• A

• B

• C

• D

What does one observe on the screen in a Young's experiment if white light illuminates the double slit instead of light of a single wavelength?

• A white central fringe and no other fringes

• A dark central fringe and a series of alternating white and dark fringes on each side of the center

• A white central fringe and a series of colored and dark fringes on each side of the center

• A continuous band of colors with no dark fringes anywhere