Light is a form of energy produced by a
An example for non-luminous object is ___________.
he phenomenon by which the incident light falling on a surface is sent back into the same medium is known as
When light is incident on a polished surface ___________ reflection takes place.
An object becomes invisible when it undergoes ______ reflection.
According to the laws of reflection,
The image formed by a plane mirror is always _______.
The centre of the sphere of which the spherical mirror forms a part is called ____________.
The focus of a concave mirror is ________.
A converging mirror is known as ________.
The relation between the focal length and radius of curvature of a mirror is _______.
Radius of curvature of a concave mirror is always _____ to the mirror.
An image formed by a convex mirror is always ________.
If the image formed by a concave mirror is virtual, erect and magnified, then the object is placed __________.
Dentists use a _____________ to focus light on the tooth of a patient.
An object is placed 1.5 m from a plane mirror. How far is the image from the person?
An object placed 2m from a plane mirror is shifted by 0.5 m away from the mirror. What is the distance between the object and its image?
What is the angle between the incident and reflected rays when a ray of light is incident normally on a plane mirror?
A ray of light is incident on a plane mirror and the angle of incidence is 25 degrees. What is the angle of reflection?
A ray of light is incident on a plane mirror and the angle of reflection is 50o. Calculate the angle between the incident ray and the reflected ray.
Which of the following is used to make a periscope?
Which mirror has a wider field of view?
A ray of light passing through the _______ retraces its path.
When an object is placed at the focus of a concave mirror, the image will be formed at ________.
Butter paper is an example for _______ object.
An object of size 2.0 cm is placed perpendicular to the principal axis of a concave mirror. The distance of the object from the mirror equals to the radius of curvature. The size of the image will be ______________.
f an incident ray passes through the centre of curvature of a spherical mirror, the reflected ray will __________________.
Ray optics is valid when characteristic dimensions of obstacles are:
Focal length of plane mirror is:
Magnification produced by plane mirror is:
(a) +1 (b) -1
(c) < 1 (d) > 1
The magnification produced by a mirror is 1/3, then the type of mirror is
A stick partially immersed in water appears broken due to
Mirage is produced in hot deserts due to
The unit of power of a lens is
The astigmatism can be corrected by
The human eye can distinguish between different colours due to the presence of
The accommodation of a normal eye is from
A person suffering from presbyopia should use
The rod-shaped cells on the retina respond to
Myopia and hypermetropia can be corrected by using ________ lens and ________ lens respectively.