Light enters from air into a glass plate having refractive index 1.50. What is the speed of light in glass ?(The speed of light in vacuum is 3 x 108 m/s)
2 x 108 m/s
1.82 x108 m/s
4 x108 m/s
none of these
Which prism replace mirrors in good periscope?
Totally reflecting prism
Diffuse reflecting prism
Regular reflecting prism
Triangular glass prism
the fatter ( more curved ) a converging lens is
The shorter its focal length and more it magnifies
The longer its focal length and more it magnifies
The longer its focal length and less it magnifies
The shorter its focal length and less it magnifies
A diverging lens has
A real principal focus
A virtual principal focus
No principal focus
A principal focus same as a converging lens
The bending of light when it passes from one medium to another is called
Reflection
Refraction
Total internal reflection
Diffuse reflection
When a ray of light enters an optically denser medium it
Bent towards the normal
Bent away from the normal
Pass parallel to the normal
Never bends
The image which cannot be formed on a screen is called
Virtual image
Real image
Laterally inverted image
Diminished image
When dispersion occurs due to fall of light in a prism we will get a colour pattern or a band of colours known as
white band
spectrum
ultraviolet rays
If a parallel beam of light falls on a plane mirror or on a perfectly polished surface.
Regular reflection occurs
Diffuse reflection occurs
Total internal reflection occurs
Refraction occurs
A person watching a fish in a fish tank, its size thus seen will be
big
small
not comparable
