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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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A small telescope has an objective lens of focal length 140cm and an eyepiece of focal length 5.0cm. What is the magnifying power of the telescope for viewing distant objects when the telescope is in normal adjustment (i.e., when the final image is at infinity)?(ii) the final image is

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 140cm and an eyepiece of focal length 5.0cm. What is the magnifying power of the telescope for viewing distant objects when (i)For the telescope described in Exercise 34 (a), what is the separation between the objective lens and the

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

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A Cassegrain telescope uses two mirrors as shown in Fig. Such a telescope is built with the mirrors 20mm apart. If the radius of curvature of the large mirror is 220mm and the small mirror is 140mm, where will the final image of an object at infinity

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

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Light incident normally on a plane mirror attached to a galvanometer coil retraces backwards as shown in Fig. . A current in the coil produces a deflection of 3.5o of the mirror. What is the displacement of the reflected spot of light on a screen placed 1.5 m

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

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Figushows an equiconvex lens (of refractive index 1.50) in contact with a liquid layer on top of a plane mirror. A small needle with its tip on the principal axis is moved along the axis until its inverted image is found at the position of the needle. The distance of the needle from the lens is measured to be 45.0cm. The liquid is removed and the experiment is repeated. The new distance is measured to be 30.0cm. What is the refractive index of the

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

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Why does bluish colour predominate in a clear

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

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A concave lens of refractive index 1.5 is immersed in a medium of refractive index 1.65. What is the nature of the

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

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A biconvex lens made of a transparent material of refractive index 1.25 is immersed in a water of refractive index 1.33. Will the lens behave as a- converging or a diverging lens? Give

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

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A biconvex lens made of a transparent material of refractive index 1.5 is immersed in a water of refractive index 1.33. Will the lens behave as a converging or a diverging lens? Give

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

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A convex lens is placed in contact with a plane mirror. A point object at a distance of 20 cm on the axis of this combination has its image coinciding with itself. What is the focal length of the

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

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Write the relationship between angle of incidence i, angle of prism A and angle of minimum deviations from a triangular

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

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How does focal length of a lens change when red light incident on it is replaced by violet light? Give reason for your

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

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Name the physical quantity which remains same for microwaves of wavelength 1 mm and UV-radiation of `1600 A^0` in

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

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Under what condition, does a biconvex lens of glass having a certain refractive index act as a plane glass sheet when immersed in a

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

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For the same value of angle of y incidence, the angles of refraction in three media A, B and C are 15°, 25° and 35° respectively. In which medium, would the velocity of light be

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

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When monochromatic light travels from one medium to another, its wavelength changes but frequency remains the same.

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

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The refractive index of diamond is much greater than that of glass. How does a diamond cutter make use of this

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

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If a ray of light propagates from a rarer to a denser medium, how does its frequency

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State the criteria for the phenomenon of total internal reflection of light to take

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

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