# What Can We Say About The Relative Sizes Of The Indices Of Refraction Of These Media?

## In which of the media is the light traveling faster?

Light waves travel much faster than sound waves. Light waves do not need a medium in which to travel but sound waves do. Explain that unlike sound light waves travel fastest through a vacuum and air and slower through other materials such as glass or water.

## Where does the observer perceive the mirror image of the source to be located?

Where does the observer perceive the mirror image of the source to be located? Trace the light rays from the object to the mirror to the eye. Since the brain assumes that light travels in a straight line simply extend the rays back behind the mirror to locate the image.

## How tall does the mirror have to be so that you can see yourself entirely?

In other words to view an image of yourself in a plane mirror you will need an amount of mirror equal to one-half of your height. A 6-foot tall man needs 3-feet of mirror (positioned properly) in order to view his entire image.

## When you look at a fish in a still stream from the bank the fish appears shallower than it really is due to refraction from directly above it appears?

Light rays reflected from the fish are refracted at the surface of the water but the eyes and brain trace the light rays back into the water as thought they had not refracted but traveled away from the fish in a straight line. This effect creates a “virtual” image of the fish that appears at a shallower depth.

## What is true of a virtual image?

Virtual images can be either upright or inverted. Virtual images can be magnified in size reduced in size or the same size as the object. Virtual images can be formed by concave convex and plane mirrors. Virtual images are not real thus you could never see them when sighting in a mirror.

## What does the law of reflection say?

Definition of law of reflection

: a statement in optics: when light falls upon a plane surface it is so reflected that the angle of reflection is equal to the angle of incidence and that the incident ray reflected ray and normal ray all lie in the plane of incidence.

## How does distance from the mirror affect the size of the mirror needed?

It does not matter how far away you stand from a mirror your reflection will still show the same amount of your body. The size of your image in the mirror is half the size you are in real life!

## Which of the following best describes the size and type of the image formed by the plane mirror?

8. Which of the following best describes the image formed by a plane mirror? When you look at your image in a plane mirror you see an upright image it is located on the other side of the mirror (and thus is virtual) finally it has the same dimensions (height width) as yourself (the object).

## When the reflection of an object is seen in a flat mirror the image is?

A plane mirror always forms a virtual image (behind the mirror). The image and object are the same distance from a flat mirror the image size is the same as the object size and the image is upright.

## Where should a light source be placed with respect to a concave mirror to form a searchlight?

The source of light should be put at the focal point of the concave mirror so that it obtains parallel beam of light rays which travel parallel with the respect of principal axis . And one such example where it is used is in headlights search lights( torch).

## Is the image inverted or upright?

When the image is on the same side of the mirror as the object and the image distance is positive then the image is said to be real and inverted. When the image of the object is behind the mirror and the image distance is negative the image is said to be virtual and upright.

## How do we know that the virtual image really exists?

In other words a virtual image is found by tracing real rays that emerge from an optical device (lens mirror or some combination) backward to perceived or apparent origins of ray divergences. … Although the rays of light seem to come from behind the mirror light from the source only exists in front of the mirror.

## Are all real images larger than the object?

Are all real images larger than the object? No. Real images can be larger than the object smaller than the object or the same size as the object.

## Which of the following can produce a virtual image larger in size than the object?

concave mirror

Solution: (ii) A virtual image larger than the object can be produced by a concave mirror.

## What are laws of reflection and refraction?

1- Incident ray reflected ray and normal will lie in the same plane. 2- Angle of incidence will be equal to the angle of reflection. Laws of Refraction- 1- Incident ray reflected ray and normal will lie in the same plane. 2- Refraction depends on the medium through which the light rays travel.

## Why is the law of reflection important?

The law of reflection says that for specular reflection the angle at which the wave is incident on the surface equals the angle at which it is reflected. Mirrors exhibit specular reflection. In acoustics reflection causes echoes and is used in sonar. In geology it is important in the study of seismic waves.

## How can you demonstrate the laws of reflection?

So if a wave hits a mirror at an angle of 36° it will be reflected at the same angle (36°). You can investigate the law of reflection using a light box mirror and angle measurer. An incident ray of light hits a plane mirror at an angle and is reflected back off it.

## How does changing the location of the object from the lens mirror affect the image formed?

The image is real light rays actually focus at the image location). As the object moves towards the mirror the image location moves further away from the mirror and the image size grows (but the image is still inverted). When the object is that the focal point the image is at infinity.

## What effect does your distance from the plane mirror that is half your height have?

The distance of the half-height mirror has no effect. If you move closer to the plane of the mirror your image moves closer too.

## Does the height of the mirror depend on the distance between the person and the mirror?

The height of a mirror does not depend on the distance between the mirror and the object.

## What is the relation between the incident ray the reflected ray and the surface of a plane mirror?

A plane mirror is a mirror with a flat (planar) reflective surface. For light rays striking a plane mirror the angle of reflection equals the angle of incidence. The angle of the incidence is the angle between the incident ray and the surface normal (an imaginary line perpendicular to the surface).

## How can you describe the image formed by a plane mirror quizlet?

The image formed by a plane mirror is always virtual (meaning that the light rays do not actually come from the image) upright and of the same shape and size as the object it is reflecting.

## Which characteristics best describe the image produced by a plane mirror?

Image formed by a plane mirror is always virtual and erect. The size of the image is equal to that of the object. The image formed is as far behind the mirror as the object is in front of it.

## When you see your reflection in a flat plane mirror what type of image are you seeing?

In flat or plane mirrors the image is a virtual image and is the same distance behind the mirror as the object is in front of the mirror. The image is also the same size as the object. These images are also parity inverted which means they have a left-right inversion.

## What is true about reflected light?

Reflection is when light bounces off an object. If the surface is smooth and shiny like glass water or polished metal the light will reflect at the same angle as it hit the surface. … For a smooth surface reflected light rays travel in the same direction. This is called specular reflection.

## What type of mirror is used whenever a larger image of an object is needed?

Henec we can say that a convex type of mirror is used whenever a magnified image of an object is needed. Note: Firstly we considered that a convex lens is included inside a convex mirror. We already knew that Magnifying glasses are frequently made with convex mirrors.

## Why we use concave mirrors in torches?

A concave mirror is used in torch lights because the light ray from the source placed on the focus of a concave mirror are reflected in such a way that the reflected ray are strong straight and parallel.

## What should be the position of the object when a concave mirror is used in torches?

1) A concave mirror produces a virtual and magnified image when the objects placed very close (between P and F or between C and F) to it. This position should be used for shaving mirror. 2) When the object is placed at the focus it generates a parallel beam of light. So for torches the object should be at F.

## What is the significance of concave mirror in an electric torch?

Concave mirrors in torches and headlights are used as reflectors. The source of light is placed at the focus of a concave mirror such that the light rays emerge out as parallel beams after getting reflected in the mirror.

## What can you say about the size of the image if the value of its magnification is 1?

A magnification of 1 (plus or minus) means that the image is the same size as the object. If m has a magnitude greater than 1 the image is larger than the object and an m with a magnitude less than 1 means the image is smaller than the object.

## Why focal length of concave mirror is negative?

Light rays from infinity parallel to the principal axis thus meet at the a point on the principal axis on the side of the mirror which is towards the object. This distance is considered as negative since it is on the side of the object. Hence the focal length of a concave mirror is negative.

## When image formed is smaller than object then magnification is?

Also if the image is smaller than the object magnification is less than 1 because the image generated is smaller than the actual object.

## What is said about a virtual image formed by any type of mirror?

Virtual images formed by mirrors are always upright images.

## How can you identify a virtual image?

Virtual images can be seen directly without using a screen for projection. The most common virtual images are those produced by a flat or plane mirror. As shown in the diagram below the virtual image appears the same distance behind the plane mirror as the object is in front of the mirror.

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