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
When a light ray is reflected repeatedly by a set of parallel plane mirrors, the intensity of light rays decreases after some reflections. This is because of:
Poor reflection from mirrors
Absorption of some amount of light by mirrors
Dispersion of light when the rays travel through the atmosphere
Scattering of light by the mirrors
Refraction of light takes place in the
Pupil
Cornea
Iris
Retina
Nocturnal animals like owl & bat have :
Large cornea
Large pupil
Retina with large number of rods
All of the above
The least distance of distin vision for a young adult with normal vision is about:
25m
2.5cm
25cm
2.5m
The human eye forms the image of an object at its:
cornea
iris
pupil
retina
The angle of incidence and angle of reflection in a plane mirror is :
Equal
Greater
Less
1/3rd of incident value
The E.N.T. doctor uses a
Convex mirror
Convex lens
Plane mirror
Concave mirror
If the angle of incidence is 80°, what will be the angle of reflection with respect to the normal drawn perpendicular at the point of reflection?
80°
1000
160°
20°
