Question:concave mirror uses

Answers:1. headlights of cars 2. dentist's mirror 3. solar devices 4. reflecting telescopes 5. satellite dishes 6. personal uses(men shaving, women applying make-ups etc) 7. reflectors in flash-lights 8. electron microscopes

---

Question:My friends and I don't know how to solve this problems for our summer physics homework. Help please. Step-by-step would be great! A plane mirror and a concave mirror (f=8.0cm) are facing each other and are separated be a distance of 20.0cm. An object is placed 10.0cm in front of the plane mirror. Consider the light from the object that reflects first from the plane mirror and then from the concave mirror. Using a rad diagram drawn to scale, find the location of the image that this light produces in the concave mirror. Specify this distance relative to the concave mirror.

Answers:This is an example of what's called 'folded optics.' Here's one way to approach this problem: Ignore the concave mirror for a moment and consider yourself facing the plane mirror; what do you see? Your image as far 'behind' the plane mirror as you are in front of it? Yes! This is what the concave mirror 'sees' - the image of the object >as if< it were 10.0 cm >behind< the plane mirror. Now, to solve this problem, pretend that the plane mirror is not there at all. Pretend rather that the object itself is 10.0 cm >beyond< the plane mirror. If you know how to solve that problem, you can solve the one given. The answer will be the same. The concave mirror doesn't care either way. As far as it's concerned, the image it sees is >the one behind the mirror.< I have not done this problem for you, giving you answers in centimeters and so forth, because it is a homework problem for you to work out yourself. Were I to solve it for you, I would be cheating you out of part of your education, and that wouldn't be right, yes? So, give it a shot and let me know how it turns out, okay? Take care, -b

---

Question:Use the mirror equation to determine the image distance of the image formed by a 2 cm high object that is located at an object distance of 10 cm from a concave mirror that has a radius of curvature of 14 cm. Use the thin lens equation to calculate the image distance of the image formed by a 3 cm high object that is located 5 cm from a convex (converging) lens having a focal length of 4 cm.

Answers:Ok, you're given d sub o, which is 2cm, and the center, which is twice the focus, making the focus 7 cm. Using the equation 1/f = 1/d sub o + 1/d sub i, you would get your image distance, which would be 23.3 cm. You would do the same with the convex mirror, except they give you a focus, so your equation would look like 1/4 = 1/5 + 1/d sub i, making d sub i 20 cm.

---

Question:A concave shaving mirror has a radius of curvature of 35cm. It is positioned so that the upright image of a man's face is 2.50 times the size of the face. How far is the mirror from the face?

Answers:Let th edistance of image be v then -1/v+1/u = 1/f, multiply by v -1+2.5 = v/(35/2) or 1.5 = 2v/35 or v = (35x1.5)/2 = 26.5 cm behind the mirror or u = 26.5/25 = 10.5 cm in front of mirror.

---