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A person looking at a person wearing a shirt with a pattern comprising vertical and horizontal lines is able to see the vertical lines more distinctly than the horizontal ones. What is this defect due to? How is such a defect of vision

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

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A man with normal near point (25 cm) reads a book with small print using a magnifying glass: a thin convex lens of focal length 5 cm. What is the closest and the farthest distance at which he should keep the lens from the page so that he can

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

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A man with normal near point (25 cm) reads a book with small print using a magnifying glass: a thin convex lens of focal length 5 cm. What is the maximum and the minimum angular magnification (magnifying power) possible using the above simple

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

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A card sheet divided into squares each of size 1 mm2 is being viewed at a distance of 9 cm through a magnifying glass (a converging lens of focal length 9 cm) held close to the eye. What is the magnification produced by the lens? How much is the

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

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A card sheet divided into squares each of size 1 mm2 is being viewed at a distance of 9 cm through a magnifying glass (a converging lens of focal length 9 cm) held close to the eye. What should be the distance between the object and the magnifying

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

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Explain: The angle subtended at the eye by an object is equal to the angle subtended at the eye by the virtual image produced by a magnifying glass. In what sense then does a magnifying glass provide angular

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

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Explain: In viewing through a magnifying glass, one usually positions one’s eyes very close to the lens. Does angular magnification change if the eye is moved

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

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Explain: Magnifying power of a simple microscope is inversely proportional to the focal length of the lens. What then stops us from using a convex lens of smaller and smaller focal length and achieving greater and greater magnifying

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

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Explain: 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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Explain: When viewing through a compound microscope, our eyes should be positioned not on the eyepiece but a short distance away from it for best viewing. Why? How much should be that short distance between the eye and

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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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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