The electric nature of lightning was established by a scientist named:
Isaac Newton
Robert Hooke
Benjamin Franklin
Thales
The E.N.T. doctor uses a
Convex mirror
Convex lens
Plane mirror
Concave mirror
The commonly used unit for wavelength of light is
Angstrom
Metre
Light year
None of these
When the distance between the object and the plane mirror increases:
the image remains same
the size of the image will become less than the size of the object
the distance between the image and the plane mirror increases
the distance between the image and the plane mirror decreases
The angle of incidence is
the angle that the incident ray makes with the mirror
the angle that the incident ray makes with the normal at the point of incidence
180° minus the angle that the incident ray makes with the mirror
the angle that the incident ray makes with the reflected ray
When white light passes through a prism, the colour that undergoes maximum deviation is
Red
Yellow
Violet
Green
A person cannot see the distant objects clearly(though he can see the nearby objects clearly). He is suffering from the defect of vision called:
hypermetropia
myopia
night blindness
cataract
The defect of vision in which the eye-lens of a person gets progressively cloudy resulting in blurred vision is called:
The angle between an incident ray and the plane mirror is 300. The total angle between the incident ray and the reflected ray will be:
300
600
900
1200
The size of the pupil of the eye is adjusted by:
cornea
ciliary muscles
optic nerve
iris
