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Five long wires A, B, C, D and E, each carrying current I are arranged to form edges of a pentagonal prism as shown in Fig. Each carries current out of the plane of paper. What if current in one of the wire (say) A is

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

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Find the position, nature,and magnification of the image. An object is placed at 10

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

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Find the position, nature,and magnification of the image. An object is placed at 5 cm in front of a concave mirror of radius of curvature 15

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Suppose while sitting in a parked car, you notice a jogger approaching towards you in the side view mirror of R = 2 m. If the jogger is running at a speed of 5 m s–1, how fast the image of the jogger appear to move when the jogger is

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

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Suppose while sitting in a parked car, you notice a jogger approaching towards you in the side view mirror of R = 2 m. If the jogger is running at a speed of 5 m s–1, how fast the image of the jogger appear to move when the jogger is

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

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Suppose while sitting in a parked car, you notice a jogger approaching towards you in the side view mirror of R = 2 m. If the jogger is running at a speed of 5 m s–1, how fast the image of the jogger appear to move when the jogger is

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

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Suppose while sitting in a parked car, you notice a jogger approaching towards you in the side view mirror of R = 2 m. If the jogger is running at a speed of 5 m s–1, how fast the image of the jogger appear to move when the jogger is

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

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The earth takes 24 h to rotate once about its axis. How much time does the sun take to shift by 1º when viewed from the

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

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Light from a point source in air falls on a spherical glass surface (n = 1.5 and radius of curvature = 20 cm). The distance of the light source from the glass surface is 100 cm. At what position the image is

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

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A magician during a show makes a glass lens with n = 1.47 disappear in a trough of liquid. What is the refractive index of the liquid? Could the liquid be

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

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The radii of curvature of the faces of a double convex lens are 10 cm and 15 cm. Its focal length is 12 cm. What is the refractive index of

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

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A convex lens has 20 cm focal length in air. What is focal length in water? (Refractive index of air-water = 1.33, refractive index for air-glass =

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

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(i) Fig. shows a cross-section of a ‘light pipe’ made of a glass fibre of refractive index 1.68. The outer covering of the pipe is made of a material of refractive index 1.44. What is the range of the angles of the incident rays with the axis of the pipe for which total reflections inside the pipe take place, as shown in the figure.(ii) What is the answer if there is no outer covering of the

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

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The image of a small electric bulb fixed on the wall of a room is to be obtained on the opposite wall 3m away by means of a large convex lens. What is the maximum possible focal length of the lens required for the

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

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A screen is placed 90cm from an object. The image of the object on the screen is formed by a convex lens at two different locations separated by 20cm. Determine the focal length of the

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

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An angular magnification (magnifying power) of 30X is desired using an objective of focal length 1.25cm and an eyepiece of focal length 5cm. How will you set up the compound

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

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You are given two converging lenses of focal length 1.25 cm and 5 cm to design a compound microscope. If it is desired to have a magnification of 30, then find out the separation between the objective and

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

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A small telescope has an objective lens of focal length 150 cm and eyepiece of focal length 5 cm. What is the magnifying power of the telescope for viewing distance objects in normal adjustments. If this telescope is used to view a 100 m tall tower 3 km away, then what is the height of the tower formed by the objective

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

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Use the mirror equation to show that on object placed between F and 2F of a concave mirror produces a real image beyond 2

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

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Two monochromatic rays of light are incident normally on the face AB of an isosceles right-angled prism AB C. The refractive indices of the glass prism for the two rays 1 and 2 are respectively 1.35 and 1.45. Trace the path of these rays after entering through the prism.

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

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