7805

Physics Ray Optics Level: Misc Level

Use Le Chateliers principle to explain why low pressure is used in the freeze- drying process(e.g.in making instant coffee)


7587

Physics Ray Optics Level: Misc Level

The objective lens of an astronomical telescope forms an image of a distant object at the focal point of the eyepiece, which has a focal length of 5.0 cm.If the two lenses are 45.0 cm apart, what is the angular magnification?


7586

Physics Ray Optics Level: Misc Level

Keesha is looking at a beetle with a magnifying glass.She wants to see an upright, enlarged image at a distance of 25 cm.The focal legth of the magnifying glass is +5.0 cm .Assume that Keesha,s eye is close to magnifying glass.(a)What should be the distance between the magnifying glass and the beetly?(b)What is the angular magnification?


7585

Physics Ray Optics Level: Misc Level

Suppose that the lens system(cornea+lens) in a particular eye has a focal length that can very between 1.85 and 2.00 cm, but the distance from the lens system to the retina is only 1.90 cm, (a) Is this eye nearsighted or farsigted?Explain (b) What range of distances can the eye see clearly without corrective lenses? (Assume that the normal near point is 25 cm)


7584

Physics Ray Optics Level: Misc Level

A photographer wishes to take a photograph of the Eiffel Tower.(300 m tall) from Across the Seine River,a distance of 300 m from the tower. What focal length lens should she use to get an image that is 20 mm high on the film?(For 35 mm film, each ''is 24 mm high by 36 mm wide).


7583

Physics Ray Optics Level: Misc Level

A converging lens and a diverging lens, separated by a distance of 30.0 cm,are used in combination. The converging lens has a focal length 15.0 cm.The diverging lens is of unknown focal length. An object is placed 20.0 cm in front of the converging lens; the final image is virtual and is formed 12.0 cm before the diverging lens. What is the focal length of the diverging lens?


7578

Physics Ray Optics Level: Misc Level

prove that a ray of light reflected from a plane mirror rotates through an angle2 theta when the mirror rotates through an angle theta about an axis perpendicular to the plane of incidence


7577

Physics Ray Optics Level: Misc Level

A horizontal, parallel-sided plate of glass having a refractive index of 1.52 is in contact with the surface of water in a tank.A ray coming from above in the air makes an angle of incidence of 35 degrees with angle does the ray refracted into the water makes with the normal to the surface and what is the dependence of this angle on the refractive index of the glass?


6764

Physics Ray Optics Level: Misc Level

Write electronic configurations of Cr3+,O2-( at no.Cr=24, O=8).


6736

Physics Ray Optics Level: Misc Level

The index of refraction of diamond is 2.42.This means that a given wavelength of light travels

a. 2.42 times faster in air than it does in diamond.

b.2.42 times faster in diamond than it does in air.

c.2.42 times faster in vacuum than it does in diamond.

d.2.42 times faster in diamond than it does in vacuum.


6715

Physics Ray Optics Level: Misc Level

Define utility .Describe the law of diminishing marginal utility.


6531

Physics Ray Optics Level: Misc Level

the sum of the volumes of two cubes is 2000 cu. Inches. What should their edge lengths be in order to maximize the sum of their surface areas?


6425

Physics Ray Optics Level: Misc Level

Why do aging people have vision difficulties?


6330

Physics Ray Optics Level: Misc Level

A light beam composed of red and blue light is incident upon a rectangular glass plate, as shown. The light emerges into the air from point P as two separate beams

a. that are parallel, with the blue beam displaced below the red beam.

b.that are parallel, with the red beam displaced below the blue beam.

c. that are not parallel, with the red beam displaced below the blue beam.

d. that are parallel, with the blue beam displaced below the red beam.

e. None of the listed is correct.


6328

Physics Ray Optics Level: Misc Level

We have seen that two monochromatic light waves can interfere constructively or destructively, depending on their phase difference. One consequence of this phenomena is 

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

b. the way in which polaroid sunglasses work.

c. the formation of an image by a converging lens, such as the lens in your eye.

d. a rainbow.

e. the appearance of a mirage in the desert.


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