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(i) Draw a ray diagram for formation of image of a point object by a thin double convex lens having radii of curvatures `R_1 and R_2` and hence, derive lens maker's formula. (ii) Define power of a lens and give its SI unit. If a convex lens of length 50 cm is placed in contact coaxially with a concave lens of focal length 20 cm, what is the power of the

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

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(i) Draw the ray diagram for the formation of image of an object by a convex mirror and use it (along with the sign convention) to derive the mirror formula. (ii) Use the mirror formula to show that for an object kept between the pole and focus of a concave mirror the image appears to be formed behind the

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Draw a ray diagram of a reflecting type telescope. State two advantages of this telescope over a refracting

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Draw a schematic diagram of refracting telescope. Write its two important

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Draw a ray diagram for the formation of image by a compound microscope. Write the expression for total magnification when the image is formed at

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A convex lens of focal length 25 cm is placed coaxially in contact with a concave lens of focal length 20 cm. Determine the power of the combination. Will the system be converging or diverging in

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

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Draw a schematic arrangement of a reflecting telescope (Cassegrain) showing how rays coming from a distant object are received at the eyepiece. Write its two important advantages over a refracting

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

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Two convex lenses of same focal length but of apertures `A_1 and A_2 (A_2 < A_1)`, are used as the objective lenses in two astronomical telescopes having identical eyepieces. What is the ratio of their resolving power? Which telescope will you prefer and why? Give

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Define the resolving power of a telescope. Write any two advantages of a reflecting telescope over a refracting

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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

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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

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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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