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To find focal length of a Concave Mirror
To find focal length of a Concave Mirror
Theory
Theory
Procedure
Animation
Simulation
VivaVoce
Reference
1)
A thin lens and spherical mirror, each has a focal length of +25cm.
Both are convex.
Both are concave.
The lens is convex and the mirror is concave.
The lens is concave and the mirror is convex.
2)
A convex lens of focal length f, forms the image of an object equal in size of the object. The object is placed at a distance
greater than 2f.
less than f.
equal to 2f.
between f and 2f.
3)
A parallel beam of light falls on a mirror. All the rays of the beam after reflection, actually intersect at a point. The mirror is a :
plane mirror.
convex mirror.
concave mirror.
none of the above.
4)
A real image :
is formed when reflected rays dont actually meet but appear to diverge from a point.
cannot be obtained on a screen.
can be obtained on a screen.
is always erect.
5)
An object 2.0 cm in size is placed 20.0 cm in front of a concave mirror of focal length 10.0 cm. Find the distance from the mirror at which a screen should be placed in order to obtain a sharp image. What will be the size and nature of the image formed?
image distance 3 cm real ,inverted same size as object.
image distance 2 cm real ,inverted same size as object.
image distance 4 cm imaginary ,erect, larger size than object.
image distance 2 cm imaginary ,erect, larger size than object.