Advertisements
Advertisements
प्रश्न
A rectangular block of glass ABCD has a refractive index 1.6. A pin is placed midway on the face AB (Figure). When observed from the face AD, the pin shall ______.
- appear to be near A.
- appear to be near D.
- appear to be at the centre of AD.
- not be seen at all.
पर्याय
a and c
a and d
b and d
c and d
Advertisements
उत्तर
a and d
Explanation:
As long as angle of incidence on AD of the ray emanating from the pin is less than the critical angle, the pin shall appear to be near A.
When angle of incidence on AD of the ray emanating from pins is greater than the critical angle, the light suffers from total internal reflection and cannot be seen through AD.
APPEARS IN
संबंधित प्रश्न
State the conditions required for total internal reflection of light to take place
Total internal reflection occurs only when a ray of light passes from a ______ medium to a ______ medium.
Plot a graph between
Angle of incidence versus angle of refraction.
If a ray of light passes from medium I to medium II without any change of direction, what can be said about the refractive indices of these media (angle I is not 0)?
Name the factors affecting the critical angle for the pair of media.
Complete the following diagram to show the path of the ray of a single colour in the diagram as if enters in and emerges out of the prism. Mark the angles wherever necessary. (Critical angle for glass = 42°).
A ray of light is incident on a glass surface at an angle of 50° with the corresponding angle of refraction 30°. Find the value of the R.I. of glass.
A spherical marble, of refractive index 1.5 and curvature 1.5 cm, contains a tiny air bubble at its centre. Where will it appear when seen from outside?
Which of the following is not involved in formation of a rainbow?
Answer the following question.
Under what conditions are total internal reflection possible? Explain it with a suitable example.
Observe the given figure and write appropriate phenomenon of light in the box.
The critical angle is defined as the angle of incidence at which the total internal reflection starts to occur.
The phenomena involved in the reflection of radiowaves by ionosphere is similar to ______.
A jar of height h is filled with a transparent liquid of refractive index µ (Figure). At the centre of the jar on the bottom surface is a dot. Find the minimum diameter of a disc, such that when placed on the top surface symmetrically about the centre, the dot is invisible.
State the condition under which total internal reflection occurs. Give the mathematical expression for total internal reflection.
Name any two phenomena which take place in the formation of a rainbow.
An endoscope uses optic fiber to transmit high resolution images of internal organs without loss of information. The principle of light that is used by the optic fiber is based on ______.
State two differences between normal reflection and total internal reflection.
