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State the conditions under which total internal reflection occurs. One face of a prism with a refracting angle of 30° is coated with silver. A rayincident on another face at an angle of 45° is refracted and reflected from the silver coated face and retraces its path. Find the refractive index of the material of the

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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A tank is filled with water to a height of 12.4 cm. The apparent depth of a needle lying at the bottom of the tank is measured by a microscope to be 9.3 cm. What is the refractive index of water? If water is replaced by a liquid of refractive index 1 .6 up to the same height, by what distance would the microscope have to be moved to focus on the needle

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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The velocity of a certain monochromatic light in a given transparent medium is `2.225 xx10^8` m/s. What is the (i) critical angle of incidence (ii) polarising angle for this

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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When a ray of light passes through a triangular glass prism, find out the relation for the total deviation, `delta` in terms of the angle of incidence, i and angle of emergence, e. Plot a graph showing the variation of angle of deviation with the angle of incidence and obtain the condition for the angle of minimum

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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Light incident at an angle of incidence of 45° in a certain medium goes grazing along its surface of separation from air after refraction. What is (i) the velocity of light in this medium? (ii) the angle of incidence at which light from air must be incident on this medium so that the refracted ray is normal to the reflected ray? Also, name the special property exhibited by light for this angle of

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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(i) A giant refracting telescope has an objective lens of focal length 15 m. If an eyepiece of focal length 1.0 cm is used, what is the angular magnification of the telescope? (ii) If this telescope is used to view the moon, what is the diameter of the image of the moon formed by the objective lens? The diameter of the moon is `3.48xx10^6` m and the radius of lunar orbit is `3 .8xx10^8

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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(i) Draw a labelled ray diagram showing the formation of a final image by a compound microscope at least distance of distinct vision. (ii) The total magnification produced by a compound microscope is 20. The magnification produced by the eyepiece is 5. The microscope is focused on a certain object. The distance between the objective and eyepiece is observed to be 14 cm. If least distance of distinct vision is 20 cm. Calculate the focal length of the objective and the

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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Draw a labelled ray diagram of a refracting telescope. Define its magnifying power and write the expression for it. Write two important limitations of a refracting telescope over a reflecting type

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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Draw a ray diagram showing the image formation by a compound microscope. Hence, obtain expression for total magnification when the image is formed at the

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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A compound microscope uses an objective lens of focal length 4 cm and eyepiece lens of focal length 10 cm. An object is placed at 6 cm from the objective lens. Calculate the magnifying power of the compound microscope. Also, calculate the length of the

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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A giant reflecting telescope at an observatory has an objective lens of focal length 15 m. If an eyepiece lens of focal length 1.0 cm is used, find the angular magnification of the telescope.If this telescope is used to view the moon, what is the diameter of the image of the moon formed by the objective lens? The diameter of the moon is `3.42xx10^6` m and the radius of the lunar orbit is `3.8xx10^8

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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Two convex lenses of focal length 20 cm and 1 cm constitute a telescope. The telescope is focused on a point which is 1 m away from the objective. Calculate the magnification produced and the length of the tube if the final image is formed at a distance 25 cm from the

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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The objective of an astronomical telescope has a diameter of 150 mm and a focal length of 4.00 m. The eyepiece has a focal length of 25.00 mm. Calculate the magnifying and resolving power of telescope. (`lambda = 6000 A^o` for yellow

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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(i) Draw a neat labelled ray diagram of an astronomical telescope in normal adjustment. Explain briefly its working. (ii) An astronomical telescope uses two lenses of powers 10D and ID. What is its magnifying power in normal

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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(i) Draw a neat labelled ray diagram of a compound microscope. Explain briefly its working. (ii) Why must both the objective and the eyepiece of a compound microscope have short focal

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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Draw a schematic diagram of a reflecting telescope (Cassegrain). Write two important advantages that the reflecting telescope has over a refracting

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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Explain with the help of a ray diagram, the working of an astronomical telescope. The magnifying power of a telescope in its normal adjustment is 20. If the length of the telescope is 105 cm in this adjustment, find the focal lengths of the two

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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What is the effect on the interference fringes in a Young’s double-slit experiment, (a) the separation between the two slits is increased(b) what should the width of each slit be to obtain 10 maxima of the double slit pattern within the central maximum of the single slit

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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In a Young’s double-slit experiment, the slits are separated by 0.28 mm and the screen is placed 1.4 m away. The distance between the central bright fringe and the fourth bright fringe is measured to be 1.2 cm. Determine the wavelength of light used in the

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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In Young’s double-slit experiment using monochromatic light of wavelength λ, the intensity of light at a point on the screen where path difference is λ, is K units. What is the intensity of light at a point where path difference is

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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