# Refraction Questions and Answers (Q&A) #### jagran josh

As the object was initially placed 20 cm in front of the plane mirror, the image formed was 40 cm away from the original object. Now, when the mirror is moved 2 centimeters towards the object, the image also moves two towards the object. In this perspective, the distance of the image from the mirror will be 18+18, which is 36.

Now forty minus thirty-six is 4 centimeters, which simply defines the distance between the original and the final mirror images. You need to keep the image distance in mind and also include the distance that image moved in order to calculate the correct answer. #### denise_nambiar

(B) Bend away from the normal.

When light travels from a rarer to denser medium then the ray of light will bend away from the normal. #### FrankFFF

The answer to this is letter D. The protractor is used in order to figure out the different angles that were produced by the rays. Protractors are normally used in different math classes. A typical protractor may be made of plastic or glass. The protractor is divided into 180 equal parts that will be accurate in measuring the angles, rays, or other line segments that it can measure.

There are still other mathematical tools that can be used in mathematics and in science like the thermometer or compass. The protractor can be purchased from specialty stores and also online. Students usually have this from grade school up to college. #### uncalum

B. Light is very predictable and it follows a general set of rules for its behavior. The incident ray is the ray of light that is hitting an object. From that spot, a perpendicular line is drawn. This is known as the normal line. A ray is a line with an endpoint.

In terms of light, the endpoint would be the starting spot from the sun or other light source. The angle between these two, the incident ray and the normal line, would be considered the angle of incidence. The light that leaves the object would be called the reflected ray. #### drtaylor

When you look in a mirror you are in front of it, and the focal distance is then positive. The image must be the same size as the part of you (or an object) shown in it. A concave mirror will have a positive focal length. The formula for magnification is = height of image / height of object = -1

However, if an image is behind the mirror, the situation is different. In any case, a convex mirror will have a negative focal length. Virtual images will be located behind the mirror surface. Negative magnification means that the image formed by a spherical mirror is real and inverted. #### Ruqayya

In physics, when a ray of light is reflected back into, say, a lake or vessel of water, and is at a critical angle, the phenomenon occurs that the whole reflection is seen not just a partial one.

This critical angle on a water/air surface is normally 48.5 degrees, depending to some extent upon wavelength and therefore colour. It is the angle of incidence, the total internal reflection occurring above it. #### drtaylor

A picture is described with different images in it. One of those images is a spherical mirror. This means that the mirror is shaped like a sphere or round object. The term concave refers to the shape of it where it is curved. The focal length is twenty centimeters, but that refers to the amount of light that converges and it is the length of it.

If something is placed in this picture that is ten centimeters from the mirror and it is in front of it, it is on the mirror’s axis. This means that this is the line of rotation. The object would be twenty centimeters behind the mirror based on the placement of the object and the measurements that also are given. #### FrankFFF

Diagram A Shows a ray of light passing through glass. When light passes through glass, the light ray refracts, which means it bends towards the middle. Refraction or deflection is the bending of light as it passes from one transparent substance into another.

Light bends whenever it travels at an angle into a material with a different refractive index, which is caused by a change in momentum. When light passes from air through a solid with parallel sides, it emanates parallel to the path of the light ray that infiltrated it.  