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problems with solutions

Topic:Optics

I.D Level Problem Problem Topic
259 High school A concave spherical mirror has a , focal length of 15.0cm . Where should an object be placed such that the height of the image is a quarter of the height of the object ? . . . continues
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Optics
260 High school Where should an object be placed in front of a convex spherical mirror of 15.5 cm focal length in order to get a virtual image with a magnification of one-half ? . . . continues
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Optics
684 High school

Diffraction

Consider two diffraction gratings with the same slit separation , the only difference being that one grating has 3 slits and the other 4 slits , If both gratings are illuminated with a beam of the same monochromatic light ,

both gratings produce the same separation between orders .

the grating with 4 slits produ . . . continues
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Optics
685 High school A convex lens is placed in a flat glass plate and illuminated from above with monochromatic red light . When viewed from above , concentric bands of red and dark are observed . What does one observe at the exact center of the lens where the lens and the glass plate are in direct contact ?

A rainbow of color

A dark spot

A br . . . continues
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Optics
686 High school For a beam of light , the direction of polarization is defined as

the direction of electric field’s vibration .

the direction of the magnetic field’s vibration .

the beam’s direction of travel .

the direction that is mutually perpendicular to the electric magnetic field and magnetic field vectors

. . . continues
Solution:
For a beam of light , the direction of polarication is defined as the direction of the electric fields vibration .
Optics
687 High school Consider an oil film (n = 1.50) on water (n = 1.33) and light of wavelength 600 nm in air , incident on the film . The minimum film thickness for constructive interference of the light in air is :

100. nm

150. nm

200. nm

113. nm

. . . continues
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Optics
688 High school The index of refraction of diamond is 2.42 . This means that a given wavelength of light travels .

2.42 times faster in diamond than it does in vacuum .

2.42 times faster in air than it does in diamond .

2.42 times faster in diamond than it does in air .

2.42 times faster in vacuum than it does in diamond . . . . continues
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Optics
689 High school If two light waves are coherent , which of the following in NOT necessary ?

They must have the same frequency .

They must have the same velocity .

They must have the same amplitude .

They must have the same wavelength .

They must have a constant phase difference at every point in space .

. . . continues
Solution:
It is not necessary that they must have the same amplitude .
Optics
690 High school We have seen that two monochromatic light waves can interfere constructively or destructively , depending on their phase difference . One consequence of this phenomena is .

The colors you see when white light is reflected from a soap bubble .

The way in which Polaroid sunglasses work .

The formation of an image by a converging . . . continues
Solution:
The colors you see when light is reflected from a soap bubble .

Optics
691 High school

ë represents symbol lambda used in the solution.

Assuming that ë is the wave length of light in oil , for an oil film on water , constructive interference occurs with the minimum film thickness of :

ë

ë/4

ë/2

. . . continues
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Optics
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