When an object is placed 20 cm from a concave mirror a
real image magnified three times is formed
. When an object is placed 20 cm from a concave mirror, a real image magnified three times is formed.
When an object is placed 20 cm from a concave?
When an object is placed 20 cm from a concave mirror a
real image magnified three times is formed
. When an object is placed 20 cm from a concave mirror, a real image magnified three times is formed.
What happens when magnification is 1?
Magnification. … 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.
When an object is placed 20 cm from a concave mirror a real image magnified three times is formed find the focal length of the mirror?
Thus, the focal length of the concave mirror is
15 cm
. (b) Now, if the image is virtual and 3 times magnified, then we have to find the position of the object. Thus, the object should be placed at a distance of 10 cm to get a virtual image three times the height of the object.
What is the formula for magnification?
Magnification
(m) = h/h’
And h’ is the image height and h is the object height.
When an object is kept at a distance of 20cm from a concave mirror?
When an object is kept at a distance of 20 cm from a concave mirror, the image is formed at a distance of 10 cm. If the object is moved with a speed of 4 m/s, the speed with which the image moves is us-20 (A) 10 cm/sec (B) 1 m/sec (C) 4 m/sec (D) 0.4 m/sec.
How do u know if an object is moving?
When is an object in motion? An object is in motion if its distance relative to another object is changing. To tell if an object is moving, you
use a reference point
. If an object’s distance from another object [reference point] is changing.
What if magnification is less than 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.
What do u mean by magnification +1?
Magnification = height of the image/height of the object = distance of the image/distance of the object. The magnification produced by a plane mirror is +1 means
then the size of the image is equal to the size of the object
.
In which lens magnification is less than 1?
In
a concave mirror
, when the distance of the object is less than the focal length, the magnification will be greater than one. When the distance of the object is greater than the focal length, then the magnification is less than one.
What is the position of the image when an object is placed at a distance of 20 cm from a concave mirror of focal length 20cm?
When an object is placed at a distance of 20 cm from a concave mirror of focal length 20 cm, the position of the image is
at infinity
. The reason being, the image formed by a concave mirror is at infinity when an object is placed at its focus.
Where should an object be placed before a concave mirror of focal length 20 cm so that a real image is formed at a distance of 60 cm from it?
▶▶So, the object must be placed
between Centre of Curvature and Focus
at the distance of 30 cm from the mirror.
Which mirror is used for dentist?
A concave mirror
gives the dentist a magnified reflection of the mouth while also refracting a bit of light. This means the image in the mirror is larger, brighter, and, for the dentist, easier to see.
Is magnification positive or negative?
Magnification: The ratio of the height of the image to the height of the object is called the magnification of the spherical mirror. The
magnification of the actual image will always be negative
and the virtual image should always be positive.
What is V and U in lens formula?
where u is the distance of the object from the lens;
v is the distance of the image from the lens
and f is the focal length, i.e., the distance of the focus from the lens.
What is V and U in mirror formula?
Suppose an object is placed u cm in front of a spherical mirror of focal length f such that the image is formed v cm from the mirror, then u, v and f are related by the equation;
1/f= 1/u + 1/v
. This equation is referred to as the mirror formula. The formula holds for both concave and convex mirrors.
