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# how to find focal length of concave lens

Answer. Question. Its S.I. It is relation between focal length, radii of curvature, refractive index of material of lens and refractive index of surroundings. Answer. The concave lens L2 is placed between convex lens L1 and image needle I. Question.2. Other precautions are same as given in Experiment 3. Give rules of sign convention. Question. Read Art. How the power of lens charge w.r.t. Describe different types of lenses. 8.06. 8.10 (a). Define chromatic aberration. Result. Question.7. Answer.Relative refractive index of medium 2 w.r.t. Question. Calculate f = uv/u-v and write in column 5. For this purpose the lens is put very close to the eye in between the eye and the object to be magnified. How will you distinguish between a glass slab, a convex lens and a concave lens without touching it? Question. Define a spherical lens. Answer. The glass piece is put over a printed page and the virtual image of the printed matter is seen. Read Art. As a concave lens always forms a virtual image, its focal length can not be found directly as for a convex lens. The Dioptre is the S.I. 3. Read Art. Answer. An object needle O is placed on one side of a convex lens L1 and its real inverted image I is located (by image needle) on the other side as shown in ray diagram. 28. The placing of the convex lens should be vertical. 10 cm is the focal length of the concave mirror. Read Art. Read Art. 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Read Art. Question.30. Answer. medium 1 is the ratio of the speed of light in medium 1 to the speed of light in medium 2 Focal length of the convex lens should be less than the focal length of concave lens so that the combination is convex. 8.07. Question.34. Mention three special rays. Question.12. Question.31. Answer. Give position, nature and size of image when object is put in different positions in front of a convex lens. Question.20. The eye lens is convex. Follow steps 29, 30 and 31 of Experiment 2. Answer. Answer. Answer. Answer. Clamp the holder with concave lens on fixed upright on the I side of the convex lens. No. Describe different types of convex lenses. Question.27. Question.16. Describe different types of concave lenses. It is the distance between optical centre and principal focus of a lens. Read Art. Question. Read Art. One dipotre is the power of lens whose focal length is one metre. Read Art. Why goggles (Sun glasses) have zero power? Question.3. This will be equal to the rough focal length of the mirror. Concave lens. Read Art. 26. Define and give lens formula. Answer. Answer. It is a fixed point inside the lens on its principal axis, through which fight rays passing undeviated. Question.39.What is relative refractive index? 35. 37. Question.40.What is absolute refractive index? Question.15. Lenses are used in spectacles, microscopes, telescopes and other optical instruments. Question.13. The surfaces are curved in same direction and of same radius. Under what condition, a lens does not show the refraction. 8.01 (a). 29. Describe the difference between the images formed by a convex and a concave lens. What is the principal axis of a lens? Answer. Find difference of positions of L2 and I’ and write it as observed v in column 36. Go out in the open and face the lens towards distant tree or building. 22. Read Art. 8.01 (d). Focal length can be calculated, using lens formula, Procedure If the image has same size as the object, the glass piece is a glass slab. Question.19. Absolute refractive index of a medium is the ratio of the speed of light in vacuum to the speed of light in that medium. speed of light in vacuum. Question.25. Question.44.How chromatic aberration can be minimized? Read Art. Answer. Does power depend upon aperature of a lens? Apply index correction and write corrected values of u and v in columns 4a and 46. ^ .. Question.18. Define a lens combination. Obtain the image of the tree or the building on a white painted wall (screen) and move the lens forward and backward to get a sharp image on the wall. Answer. It is fixed point on the principal axis of a lens where a beam of fight incident parallel to its principal axis converges or appears to diverge after passing through the convex lens or concave lens. Question.5. Answer. Question.21. Hence, O2I = u and O2I’ = v. How can a convex lens be used as a magnifier? Fix this upright at some distance away from the convex lens. What type of lens is an air bubble inside water? To find the focal length of a concave lens using a convex lens. Question.11. Answer. 1. Question.6. Question.8. Question.4. Answer. 4. The refractive index of surrounding medium is greater them that of material of lens. Define different terms associated with spherical lenses. Define optical centre of a len. Under what condition, the nature of lens change? unit is metre. Question.14. What is the type of the eye lens? What is the principal focus of a lens? A thin convex lens has more focal length. Answer. Give its unit and sign. An optical bench with four upright (two fixed uprights in middle, two outer uprights with lateral movement), a convex lens (less focal length), a concave lens (more focal length), two lens holders, two optical needles (one thin, one thick), a knitting needle and a half metre  scale. Answer.It is the property of a transparent medium which resist the propagation of light in that medium. Result Describe various assumptions made in derivation of lens formula. Question. . The concave lens diverges the rays and the image is now formed at I’ as shown in ray diagram. 8.04 (c). For this purpose, indirect method is used, as described below. to wavelength of light? Question.32. Answer. Which convex lens has more focal length, thick or thin? The convex lens act as concave lens and vice-versa. unit of power. Answer. Answer. Answer. 1. Read Art. Question.17. Answer. Question. the two surrounding medium? Apparatus What is a lens maker formula? The power of a lens is different for different colour of light. The power of a lens is maximum of violet and minimum for red colour light. 8.02 (1-7). If the image is diminished, the glass piece is a concave lens. 8.08. Follow steps 2 to 4 of Experiment 2 To set the object needle, Follow steps 5 to 8 of Experiment 2 To set the image needle at I, Follow steps 21 to 27 of Experiment 2 To set the concave lens. Give expression for. The magnification of the image is judged. Question.41.Is the absolute refractive can be less than unit? What is the focal length of a lens? No, because it does not form a real image to be obtained on a screen. For concave lens, I is the virtual object and I’ is the real image. Answer. The power of a lens is maximum for vacuum or air and it decreases with increase in two refractive index of medium. Apparatus An optical bench with four upright (two fixed uprights in middle, two outer uprights with lateral movement), a convex lens (less focal length), a concave lens (more focal length), two lens holders, two optical needles (one thin, one thick), a knitting needle and a half metre scale. 9. Question.10. If the image is magnified, the glass piece is a convex lens. Measuring the focal length of a converging lens using the lens formula This experiment is sometimes used to establish the lens formula. Find difference of positions of  L2 and I and write it as observed u in column 3a. It makes virtual image for all positions of objects. Question.42.What is the power of combination of a convex and concave lens of the same focal length? 8.04 (b). Read Art. Question.38.Define refractive index. Refractive index of surroundings i.e., change of medium.

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