Based on images obtained on Google Earth, the oval-shaped object has a huge flat top and what appear to be pillars or columns that seem to reveal the entrance to a darker, inner place. b) Refractive index of a substance is the speed of the light in the vacuum to the speed of the light in a medium. Q9. So when light ray strikes the object inside water and forms a image in our eye the refracted ray makes a larger angle and thus the object appears raised. The bending of pencil will increase if water is replaced by a liquid which is much denser. Another ray OD gets refracted in the direction DY. What is the speed of light in a medium of refractive index 6/5 if its speed in air is 3,00,000 km/s? a) Explain why a stick half immersed in water appears to be bent at the surface. At the surface of the water, the straw appears to be misaligned or broken; the portion of the straw above the water is shifted relative to the image viewed under the water. Q33. (The same happens in glass, and that’s how they make lenses.) When a pencil is placed in water, it appears to be bent because of the refraction of light. Q1. A line or a spot of ink on a paper always appears to be raised when viewed through the glass slab due to the refraction of light. Q15. i)1. Draw a ray diagram indicating the change in its path. Observing Objects in Water Required fields are marked *. Write the relation between the angle of incidence and the angle of refraction for a medium. Will it bend towards the normal or away from the normal? When the light rays pass from water into glass, they bend towards the normal. b) What is meant by the refractive index of a substance? Q11. Second law of refraction state that the ratio of sine of angle of incidence to the sine of angle of refraction is equal to a constant for a given pair of media. Refractive index is least for red colour. The light travels slowest in: The correct answer is d) carbon disulphide. 2. Observing Objects in … Q32. . ) When light travelling in air is incident on these substances at equal angles, the angle of refraction will be the maximum in: Q26. OD is the second ray that gets refracted along with DY. Answer: (a) The stick appears to be bent and raised up in place of BA as BA’ due to refraction of light on passing from denser medium (water) to rarer medium (air) click here. Following is the ray of light travelling in water emerging into air: Q6. Calculate the refractive index of water. Solution : If a coin is placed in a glass of water, for a human eye the coil appears nearer than where it is. When a ray of light passes from air into glass, is the angle of refraction greater than or less than the angle of incidence? The point from which the refracted rays appear to come gives the apparent position of the coin. The refractive index for light going from glass to air will be: Q22. Q34. Therefore, I is the virtual image at the end of O. The magnification is +0.4. Rise= Real depth(R.D)−apparent depth(A.D) ⇒ Rise = R⋅D − μR⋅D. Q19. If a ray of light goes from a rarer medium to a denser medium, will it bend towards the normal or away from it? They don’t travel in a straight line. A ray of light OC coming from O passes from water into air and gets refracted away from normal (along CX). The refractive index of this substance will be: Q24. The refractive index of glass for light going from air to glass is 3/2. A ray of light travelling in air is incident on a parallel-sided glass slab. A coin placed at the bottom of a tank appears to be raised when water is poured into it. The refractive index of water with respect to air is 4/3. A class can be based on one or … 12) When an object is placed on the left at ∞ (very far) from a converging lens, its image forms on the right (a) at F. (b) at 2F. The final direction of the ray of light will be the same as the incident direction. That is why water tank appears shallower or an object placed at the bottom appears to be raised.It is found that the refractive index of denser medium, Apparent depth is smaller than real depth: It is due to refraction of light that a water tank appears shallower or an object placed at its bottom appears to be raised.Fig, shows a point object placed at the bottom of a beaker filled with water. Since the resolution might not be known when the rendering operations are captured, the Graphics2D Transformis set up to transform user coordinates to a virtual device space that approximat… The refractive index of diamond is 2.24 means that the ratio of the speed of light in air to the speed of the light in diamond is equal to 2.24. Mirage In mirage, the object such as a tree appears to be inverted as if it is situated on a bank of a pond of water. Refraction of light is the phenomenon that makes the water to appear shallower than it really is. Q17. The two refracted ray CX and DY, when produced backward, appear to meet at point I, nearer to the water surface than O. Draw a labelled ray diagram to show how a ray of light passes through a parallel sided glass block: a) If it hits the glass block at 90 degrees that is perpendicular to the glass block, b) If it hits the glass block at an angle other than 90 degrees that is obliquely to the glass block. Q16. Explain with the help of a labelled ray diagram, why a pencil partly immersed in water appears to be bent at the water surface. Q36. This is because the refractive index of a material depends inversely upon the wavelength of light. When a ray of light passes from air into a block of glass, the ray will bend towards the normal. a) First law of refraction states that the incident ray, the refracted ray, and the normal at the point of incidence all are in the same plane. Thus, for least rise μ should be least. Q28. When the light rays pass from air into these materials, they refract the maximum in: Q21. The refractive indices of four media A, B, C, and D are 1.44, 1.52, 1.65, and 1.36 respectively. Q2. Q12. Here as the object is immersed then the rays from the object is refracted from the denser medium to the air ( rarer) medium and the … b) If a ray of light passes from glass into water, which way will it bend: towards the normal or away from the normal? (a) The apparent bending of the stick is due to the refraction of light when it passes from water into air. c) Light travels through air at 300 million m/s. A ray of light passes from a medium X to another medium Y. Draw a labelled ray diagram to show the refraction of light. The speed of light in water is 2.25×108m/s. The speed of light is the maximum in the substance: Q20. An object placed under water appears to be raised. When the light rays enter these materials their speed reduces. Solution 28. In which material do you think light rays travel faster: glass or air? a) A tank full of water appears less deep than it actually is because of the refraction of light. this is because of the phenomenon of refraction. If it looked 33% larger, it would look 4m (33% of 3m is 1m, added to the 3m of its true height) tall. On the other hand the shift in the image depends directly on the refractive index. Your email address will not be published. Twinkling of stars is due to the refraction of light. We see the objects closer than their real depth to the surface. Medium is refractive index of diamond = speed of light takes place subject, place, or feeling in Picture! Does it bend towards the normal the diagram and draw the normal or away from the normal happens to speed. Media a, b, c, and carbon disulphide actual subject, place, or vibrate when ’... Is already closed by Expert ' ) ; Copyright © 2020 Applect Learning Systems.... 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