Define the principle focus of concave mirror.
2 The Radius
of ouvature of Spherical mirror
is 20cm . what is
its focal length.
3. Name a
mirror that can be an erect and
in large image of an object.
4. why do
be prefer a Convex mirror in rear view
Mirror in vehicles ?
5. a
Concave
mirror produces three times
magnified real image of an object placed 10cm
in front of
it,
where is the image
of location.
Answers
Answer:
1) Light rays that are parallel to the principal axis of a concave mirror converge at a specific point on its principal axis after reflecting from the mirror.
2)
Radius of curvature (R) = 20 cm
Radius of curvature of a spherical mirror = 2 — Focal length (f)
R= 2f
f= R/2
f = 20 / 2
f = 10
Hence, the focal length of the given spherical mirror is 10 cm
3) A concave mirror gives an erect and enlarged image of an object held between the pole and principal focus of the mirror.
4) We prefer a convex mirror as a rear-view mirror in vehicles because it gives a wider field of view, which allows the driver to see most of the traffic behind him. Convex mirrors always form a virtual, erect, and diminished image of the objects placed in front of it.
5)
m= -3 (real image)
u =-10cm
m = -v/u
v = -m * u
v = - (-3) * (-10) = -30 cm
image is at 30cm in front of the mirror.