Which act as the reflecting surface in an ordinary mirror?
Glass
Mirror
Silver at the back of the glass
All the above
Our eye has a converging lens which will form a
Real inverted image on the retina
Virtual inverted image on the retina
Virtual erect image on the retina
Real erect image on the retina
When sunlight falls on a triangular glass prism
A spectrum is obtained
Dispersion takes place
The prism separates the white light into many colours
All are true
The average adult can focus object comfortably from about
25 cm to 1 m
25 cm to infinity
25 cm to 5 m
5 cm to infinity
The centre of the lens is its
Principal axis
Principal focus
Optic centre
Focal length
The bending of light when it passes from one medium to another is called
Reflection
Refraction
Total internal reflection
Diffuse reflection
If a converging lens is fatter(more curved) then
shorter its focal length and more it magnifies
longer its focal length and more it magnifies
longer its focal length and less it magnifies
The shorter its focal length and less it magnifies.
Which prisms replace mirrors in good periscope?
Totally reflecting prism
Diffuse reflecting prism
Regular reflecting prism
Triangular glass prism
At which condition total internal reflection takes place?
Angle of incidence > critical angle
Angle of incidence = critical angle
Angle of incidence < critical angle
Angle of incidence = Angle of reflection .
Long sightedness can be corrected by using a
Diverging spectacle lens
Converging spectacle lens
Concave mirror
Convex mirror
