Sandy asks…
I think i have very mild neovascularization?
So i was looking at my eye closely with a magnifying mirror after i took off my contacts and i saw a little bit of small veins in my eyes around my cornea. Is this normal???
P.S: i think this season i have allergies since my eyes itch sometimes and i just came back from brazil and they were crazy itchy and watery
evie answers:
Dont self diagnose, go to your eye doc where he/she has the tools to fully check your eyes out. Then they can formulate a plan for that (if you have it) and the allergies.
Best of luck
Mary asks…
Radius of curvature of a mirror?
A concave mirror magnifies an object placed 30.0cm from the mirror by a factor of +3.0. what is radius of curvature? show the steps? thanks!
evie answers:
The magnification of an image is given by m=-i/o where i is the image distance and o is the object distance, so we have that m=3=-i/o or i=-3o, since 0=30cm, i=-90cm
we use this in the mirror equation:
1/i +1/o=1/f where f is the focal length
-1/90+1/30=1/f=>f=45cm
since the radius of curvature = 2f, R=90cm
Joseph asks…
What is the magnifying power of a telescope that has a mirror with 250cm radius?
Reflecting telescope makes use of a concave mirror in place of the objective lens to bring a distant object onto focus. What is the magnifying power of a telescope that has a mirror with 250cm radius and an eye piece, whose focal length is 5.0cm?
evie answers:
For a concave mirror, the focal length is half the radius of curvature, so for your example, fl = 250 cm / 2 = 125 cm. The magnification of a mirror/lens optical system is objective fl / eyepiece fl, so for your system, this is 125 cm / 5 cm = 25 power.
One note: If your telescope uses a spherical mirror, it will show significant aberrations in the image unless the mirror diameter is < 1/10 of the focal length, so you would need a mirror < 12.5 cm in diameter, or a parabolic shape, or a correcting lens to bring the light from all parts of the mirror to focus at the same point.
Mandy asks…
can you see a magnetic field with a mirror?
if you place a 30 percent magnified mirror in a magnetic field can you see the field
evie answers:
No-lines of force are invisable. You can sprinkle iron dust on a piece of paper lying on a magnet
and see the EFFECTS of the field.
Carol asks…
whats a good product for making the skin on my face more even?
I have white skin but because of pimple scarring or sun damage the tones on my face are not the same my cheeks are splotchy red, its a lot more noticeable to me when i look in a magnifying mirror. i was wondering if there is a lotion or spray that you can get in a drug store that will help renew the skin tone on my face or make the redness less noticeable.
evie answers:
The following helped me:
1.) Some of my problems were hormonal – “melasma” it’s called – I went on birth control pills and it helped alot with the darkened discolored areas on my face.
2.) You may have rosacea (pimply and red splotches) if so, you’ll need a prescription cream; don’t use drug-store stuff – in most cases the drugstore stuff just makes it worse.
3.) Read the suggestions of Dr. Nicholas Perricone – check out his books from the library or buy used from Amazon – even if you can’t follow all of his dietary and nutrition suggestions, a few done faithfully may help a great deal. It did for me.
Good luck!
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