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प्रश्न
Small air bubbles rising up a fish tank appear silvery when viewed from some particular angle is due to the ______.
विकल्प
reflection
refraction
dispersion
total internal reflection
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उत्तर
Small air bubbles rising up a fish tank appear silvery when viewed from some particular angle is due to the total internal reflection.
Explanation:
If the angle of incidence is larger than the critical angle, a light beam that is travelling from an optically denser to a rarer medium reflects back into the denser medium.
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संबंधित प्रश्न
(i) Define critical angle.
(ii) State one important factor which affects the critical angle of a given medium.
If a light ray does not undergo, refraction at the boundary between two media, the angle of incidence is:
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)?
PQ and PR are two light rays emerging from the object as shown in the figure below:
(i) What is the special name given to the angle of incidence (∠PQN) of ray PQ?
(ii) Copy the ray diagram and complete it to show the position of the image of the object P when seen obliquely from above.
(iii) Name the phenomenon that occurs if the angle of incidence ∠PQN is increased still further.
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?
Critical angle of light passing from glass to air is maximum for ____________.
State the condition under which total internal reflection occurs. Give the mathematical expression for total internal reflection.
A given ray of light suffers minimum deviation in an equilateral prism P. Additional prism Q and R of identical shape and of the same material as P are now added as shown in the figure. The ray will now suffer ______.
The angle made by incident ray of light with normal of the reflecting surface is called ______.
State two differences between normal reflection and total internal reflection.
