PAGE: SC – RLT – A – 01
1.
Yes, the speed of light wave depends on nature of the medium.
2.
No, light does not require material medium for propagation.
3.
IMAGE : –
A point where a number of light rays coming from a point source actually meet or appear to meet after reflection or
refraction is termed as the image of the point source.
4.
(a)
the angle of incidence = 90O — 30O = 60O .
(b)
the angle of reflection = 60O .
(c)
the total angle turned by the ray of light = 180O – (60O + 60O ) = 60O .
=
the angle of reflection
=
0O .
5.
The angle of incidence
6.
LIGHT is the electromagnetic waves that cause the sensation of sight in us.
7.
Light waves are ELECTROMAGNETIC waves.
8.
When a ray of light falls ‘normally’ on the surface of a mirror, it reflects back on the same path.
9.
The distance of the object from its image = 40 cm.
10.
The basic difference between :
REAL IMAGE
VIRTUAL IMAGE
A real image is formed by actual intersection of rays.
A virtual image is not formed by actual intersection
of rays.
11.
The statement made by the person is FALSE.
12.
REAL IMAGE is formed on a cinema screen.
13.
VIRTUAL IMAGE is formed by the apparent intersection of reflected light rays.
14.
The angle made by the line with the mirror surface = 90O .
15.
The object is 13 cm far form the mirror.
16.
The phenomenon is called the LATERAL INVERSION.
17.
LAWS OF REFLECTIONS :
1.
The angle of incidence ( i ) is always equal to the angle of reflection ( r ).
i.e.
2.
i
=
r
The incident ray, the reflected ray, and the normal to the mirror at the point of incidence all lie in the
same plane.
18.
In a plane mirror, the reflected rays do not intersect.
The image is formed behind the mirror due to the apparent intersection of the reflected rays, which cannot be obtained
on a screen.
Therefore, the image of an object formed by a plane mirror is a virtual image.
19.
The differences between a real image and a virtual image : –
REAL IMAGE
1.
A
real
image
is
formed
VIRTUAL IMAGE
by
actual
1.
intersection of rays.
20.
A
virtual
image
is
not
formed
intersection of rays.
2.
It can be obtained on a screen.
2.
It cannot be obtained on a screen.
3.
It is always inverted.
3.
It is always erect.
The image formed by a plane mirror is
1.
virtual and erect.
2.
of the same size as the object.
3.
as far behind the mirror as the object is in front of the mirror.
4.
laterally inverted.
by
actual