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Mirror Mirror on the wall who is the gingerest of them all?

There is no scale for the worldwide measurement of hair gingerness.


What is the function of the mirror located under the scale?

The mirror located under the scale allows the person standing on the scale to see the readings without having to bend down to look. It provides a convenient way to check the weight measurement accurately.


What is the function or the mirror located under the ammeter scale?

As you read the meter, you're supposed to line up the needle with its image in the mirror. When you do that, you know you're looking at it exactly perpendicular to the numbers, not on a slant. That eliminates the possibility of introducing an error into your reading because of "parallax".


I don't speak and I cannot hear but I always tell the truth. What am I?

A scale


What happens when you scratch a diamond in a mirror?

When you scratch a diamond against a mirror, the diamond's hardness will typically cause the mirror to scratch instead. Diamond is the hardest natural material, ranking 10 on the Mohs scale of hardness, while glass (of which mirrors are made) ranks around 5.5 on the scale, making it softer than diamond.


Why a strip of mirror is mounted under the needle and near the scale of a voltmeter How this may help to rreduce errors while taking a reading?

The strip of mirror is mounted to help eliminate parallax errors when reading the value on the scale of the voltmeter. By aligning the needle's reflection with its actual position on the scale in the mirror, the observer can avoid viewing the needle from an angle, which could result in an inaccurate reading due to parallax. This setup ensures a more precise and accurate reading of the voltmeter.


How galvanometer work?

Electricity passing through a wire coil creates a magnetic field which twists a suspended magnet and mirror. A light beam reflects off the mirror and onto a scale.


How parallax can be avoided?

To help the user avoid this problem, the scale is sometimes printed above a narrow strip of mirror, and the user positions his eye so that the pointer obscures its own reflection. This guarantees that the user's line of sight is perpendicular to the mirror and therefore to the scale. Parallax is thus avoided.


How can parallax error be avoided?

To help the user avoid this problem, the scale is sometimes printed above a narrow strip of mirror, and the user positions his eye so that the pointer obscures its own reflection. This guarantees that the user's line of sight is perpendicular to the mirror and therefore to the scale. Parallax is thus avoided.


How long is the image of a meter-stick formed by a plane mirror?

It can't be more than one meter. The length of the image depends on the position of the scale held in front of the mirror. The length of the image depends on the angle between the plane mirror and the meter stick.


If A Concave Mirror Of Radius Of Curvature cm Produces An Inverted Image 4 Times The Size Of An Object Placed On And Perpendicular To The Axis. Determine By An Accurate Scale The Position Of the objec?

If the image produced is 4 times the size of the object and inverted, then the object is placed at a distance equal to half the radius of curvature from the mirror. This would position the object beyond the center of curvature of the concave mirror. Using an accurate scale, you would measure a distance of half the radius of curvature from the mirror to locate the object.


The image in a plane mirror an be upright or inverted depending on where the object is?

The image formed in a plane mirror is always upright, regardless of the position of the object in front of it. This is because the mirror simply reflects the light rays without altering their orientation. The size and distance of the image may appear to vary, but it will always be upright.