Mirror Definition and 656 Threads

1.Dubbie is moving directly along a normal line toward a plain mirror at a speed of 3.5 m/s, what is the speed of the image relative to Dubbie? 2. What is the speed of the image, relative to Dubbie, if Dubbie walk away from the mirror surface at 3.5 m/s at an angle of 300 to the...

Question: At the bottom of a glas bath lies a mirror covered by 20cm of water.In the air,30 cm above the water there hangs a lamp.Find the distance from the mirror at which an observer looking into the water will see the image of the lamp in the mirror Relevant Formula: apparent shift...

There is a woman who is 1,75m tall standing in front of a mirror. Her eyes are to be 10cm below the top of her head. I have to find out how small the mirror can be so that she can still see her entire body in it and how high it has to be hanging on top of the floor. Now I think I can solve it...

A mirror is required with magnification 9.5 when an object is 14mm from the mirror What is the focal length My attempt: M=v/u 9.5=v/14 v=133 1/f = (1/v)+(1/u) 1/f=(1/133)+(1/14) f=12.67 Since no object is magnified when the created image is outside of 2f this answer can't be...

A spherical mirror is polished on both sides. When used as a convex mirror, the magnification is +1/4. What is the magnification when used as a concave mirror, the object remaining the same distance from the mirror? I started with: mconvex = 1/4 mconcave = ? doconvex = doconcave...

A 1.0 cm high object is situated 11.0 cm in front of a concave mirror that has a radius of curvature of 8.00 cm. Using a ray diagram drawn to scale (the mirror must be drawn to scale): (a) measure the location of the image: 6cm (infront of the mirror) (b) measure the...

Hi all, I know some men, who are amater astronomers. They made themseves reflective telescopes which can see the crescent Venus and many others in the sky. They say they make the mirrors parapolic shape although the depth of the mirror is very thin (about 1 - 2 mm). The diameters are often...

Hello, We have an installation in which we will be placing a 1/4" thick mirror which spans 7ft across and 5ft in height directly next to a "line of fire" (a gas pipe with holes which will have a flame approximately 6" in height). Our concern is that when the line of fire is turned on in...

I have a problem with which I would appreciate any help that is offered: I have a 266nm laser (frequency quadrupled 1064nm Nd:YAG), and the energy losses along the route are a little strange. The beam is reflected by two UV mirrors; however, the first mirror loses ~7% of the in-going energy...

I recently read about a proposed liquid mirror telescope to be constructed on the moon. My question is one of mechanics, hence this not being in the astronomy section. My question is regarding the shape of the surface of a rotating liquid. The design will have a dish containing a thin layer...

1. When we talk about flat mirrors, it says that the size of image appears in the mirror is the same as of the object. Is the long rectangular mirror at home that is hang on the bedroom door to see how you look like when you dress up a flat mirror? If so, then when we approach the mirror, our...

How do mirror sunglasses work? I used to think that they worked like "one way mirrors" but those are just half silvered glass - meaning that if you are standing in a bright room looking through it into a dark one you'll see your reflection but if you look from a dark room into a light room you...

Check this out: In base 2 take all (or the first several hundred thousand) the odd numbers and figure out the mirror image of the bit string for each number. Ex: mirror of 11111 is 11111 mirror of 1011101 is 1011101 mirror of 100000001111 is 111100000001 You can't really mirror an even number...

Tanya is sitting in an optometrist’s chair, facing a mirror that is 2.25 m from her eyes. It the eye chart she is looking at is hanging a wall behind her head, 1.75 m behind her eyes. How far from her eyes does the chart appear to be? Would the answer be 4 m? (2.25 m +1.75 m)... I'm...

Hello! I'm stuck on this problem... A thin flat plate of partially reflecting glass is a distance (b) from a convex mirror. A point source of light (S) is placed a distance (a) in front of the plate so that its image in the partially reflecting plate coincides with its image in the mirror...

Hi guyz, Can anyone tell me what is the difinition of the concept "Magnetic Mirror" and give me enough information about it with examples? Thanks :)

Hi, I was wondering if it would be possible to focus light down to a small point using the following method: Construct a pyramid from four identical triangular mirrors (three would also work), with the mirrored side facing inwards of course. Do not put a base on the pyramid, but instead use...

If two planes of mirrors (infinite in all directions) were facing each other with nothing in between what would they reflect? How does light come into play in this?

Is there an easy way to remember the signs used for the mirror equation? For lenses? How does one keep the signs separate with talking about mirrors and lenses? I find it confusing... Please help, thanks!

Homework Statement 1. Dubbie is moving directly along a normal line toward a plain mirror at a speed of 3.5 m/s, what is the speed of the image relative to Dubbie? 2. What is the speed of the image, relative to Dubbie, if Dubbie walk away from the mirror surface at 3.5 m/s at an angle of 300...

Convex mirror. PLEASE HELP! Homework Statement An object 30 cm tall is placed 20 cm in front of a convex mirror. If the height of the image is +10 cm, find the focal length of the mirror. Homework Equations The Attempt at a Solution I know to use 1/f = -(Image distance from V)...

Hi everybody I am not so sure if this question is suitable to be in this box, but I hope it is. I know that all metals are opaque because they have lots of free electrons which absorb the energy of photons. But a polished surface of metal reflexes light other than absorbs it, especially...

Homework Statement The rear window in a car is approximately a rectangle, 1.3 m wide and 0.30 m high. The inside rear-view mirror is 0.61 m from the driver's eyes, and 1.37 m from the rear window. What are the minimum dimensions for the rear-view mirror if the driver is to be able to see the...

Homework Statement An object is placed in front of a convex mirror with a 65 cm radius of curvature. A virtual image half the size of the object is formed. At what distance is the object from the mirror? Homework Equations 1/p + 1/q = 1/f The Attempt at a Solution I have...

When standing in front of my bathroom mirror (on the medicine cabinet above sink), I start to walk backwards. Will I be able to see more (or less) of my body in the mirror as I walk away from the mirror? Why? (For example, if I cannot see below me knees or above my eyebrows, will that...

Hallo to all members, this is my first post. Homework Statement A short Laser flush with the Energy E = 1J hits a ideally reflecting mirror, with mass m_m = 2 * 10^(-5) kg . The light has a wave length of 696 nm. The mirror is hanging on a rope with the length l = 0,1m. Homework Equations...

Homework Statement The image formed by a convex mirror is only one third the size of the object. Focal length=12cm. Find distance of image from the mirror. Please provide me with the equation of this problem. Please!

Homework Statement The reflecting surfaces of two parallel mirrors are facing each other. They are placed 10cm apart. A light source is placed in middle of the two mirrors. Calculate the distance of the 3rd reflection from the original point source in both the mirrors. Please tell me how...

Well, I'm new in town and I have a serious problem. Read the story and then tell me if its possible: In a open spot of a forest, a kid sees a sparkle from a 150 meters Manson's window. The house is located 5 meters above the forest floor level and the open spot 1-2 meters from the floor...

What would happen if: I had a sphere produced from a theoretical perfectly reflective one-way-mirror(reflective on the inside) and a shone a light into it? Would the light accumulate inside the sphere for a noticeable period of time? Would it be observable? Could light be captured this way...

An object is moved along the central axis of a spherical mirror while the lateral magnification m of it is measured. Figure 34-32 gives m versus object distance p for a range of p. What is the magnification of the object when the object is 36 cm from the mirror? I understand that m=-i/p but...

A real object is placed at the zero end of a meterstick. A large concave mirror at the 100 cm end of the meterstuck forms an image of the object at the 82.4 cm position. A small convex mirror placed at the 20 cm pisition form a final image at the 6.3 cm point. What is the radius of curvature of...

I'm studying for a test that is going to cover mirrors and lenses. I was under the impression that the focal length for any concave or convex mirror was half the radius of curvature: f=r/2 but one of the questions in my book involving a convex mirror uses a different value for f, according...

I'm hopelessly stuck on this question. Any help will be greatly appreciated. Prove that if we have a parabolic mirror with focus at F and axis of symmetry the x-axis, then a light ray emmited from F will be reflected parallel to the x-axis. To prove this consider the parabola y^2=4px (where...

we used a concave mirror and a candle for an experiment when the candle wa placed between the vertex and the focus of the mirror (f=12.7cm) a virtual image appeared behind the mirror. We measure the image distance approximately by pointing a finger towards where the image might be and got...

we used a concave mirror and a candle for an experiment when the candle wa placed between the vertex and the focus of the mirror (f=12.7cm) a virtual image appeared behind the mirror. We measure the image distance approximately by pointing a finger towards where the image might be and got...

We did an experiment with a concave mirror Concave mirror was placed on optics bench and a candle was placed at designated spots. A screen was used to see where the image was projected. But a strange thing happened. When the object was placed at the focal point, image was projected on the...

where is the principle focus of a plain mirror?

"A 4.5W flashlight with a wavelength of 550nm is shined on a perfect mirror that reflects all the light completely. a) How many photon emanate from the flashlight? b) What force is exerted on the mirror by the beam of light?" A is easy, 1.25x10^19 photon/sec. My first attempt tried to...

A fundalmental, atomic but also basic (2nd year Uni level maths and physics or less) explanation would be good.

heres the problem: a dentist wants a small mirror that, when 2.20cm from a tooth, will produce a 4.5x upright image. what kind of mirror must be used and what must its radius of curvature be? so i did the following calculations with the mirror equations i learned: m=4.5 equation to get...

Hi Why is that you can see a REAL image in a concave mirror when you are looking into the mirror?[/FONT] i tried searching the answer on the net but could not find the answer. please help thanx in advance.

hi i've got to do measure hte refractive index of a liquid with mirror and lens first of all how can i measure hte refractive index of air in this way? i don't get how i can do this, please explain :| and then for the liquid, I've been told to put the liquid over the mirror and then the...

here's the question asked: Find the two locations where an object can be placed in front of a concave mirror with a radius of curvature of 36 cm such that its image is five times its size. In each of these cases, state whether the image is real or virtual, upright or inverted. 1. i have...

Sir, I am posting these questions for the 3rd time as you didn't respond. Please respond. 1)A convergent beam of light is incident on a convex mirror of radius of curvature 60 cm as shown in figure. What is the nature and position of the image formed by it? I solved it in the following way...

Sir, 1) A beam of light incident on a plane mirror forms a real image on reflection. It is said that the incident beam in that case is convergent. Is it true? I think it is due to the fact that a plane mirror normally forms virtual images of real object. In order that a real image be...

Sir, 1) A man 2 meters tall stands 5 meters in front of a large vertical plane mirror. What is the angle subtended by his image in the mirror at his eye? I solved it in the following way: Let AB represent the man and CE represent the mirror mounted on the wall.Here I am assuming that the...

A concave mirror has a focal length of 10 cm. what is its radius of curvature?:eek: i have absolutely no idea how to solve this, please help:cry:, any advice is greatly appreciated:smile:

I have a question dealing with light and a mirror. q: A dressing mirror on a closet door is 2.0 m tall. The bottom is 0.5 m above the floor. A bare light bulb is attached to the ceiling, which is 3.0 m above the floor. The light bulb is 1 m from the closet door. The light from the bulb shines...

Hey guys, I've got a quick question if you don't mind. I understand that in order to view your full length in a mirror, that only a half-length mirror is needed; however, I'm wondering if this is true to just only see your face (if it was held up in front of you). So if my face is 15 inches...