# Focal length of convex lens experiment. To measure the focal length of a concave mirror Physics Homework Help, Physics Assignments and Projects Help, Assignments Tutors online 2019-01-10

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## NCERT Class 10 Science Focal Length of Concave Mirror and Convex Mirror It cannot be obtained on the screen. Answer: Positive, since it converges light. An ammeter is connected in series in the circuit e. Define and give lens formula. The Theory: Convex mirror A convex mirror is a curved mirror in which the reflecting surface bulges towards the light source. Which type of magnification are you expecting for this image? Answer: The nature of image formed by the concave mirror is real and inverted for distant object.

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## Concave Lens What is the principal axis of a lens? Describe different types of convex lenses. Answer: Plane mirror forms a virtual image, and, lies as far behind the mirror as the object lies in front of it and is laterally inverted. Then place the concave lens at a different position in between the convex lens and screen and record the values in the tabular column. Also put the object at the 0 point of the optical bench. Put the concave lens in contact with the convex lens.

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## Experiment to determine the focal distance and magnification of a converging lens The illuminated object should be placed in the region of the optical centre. Under what condition, a lens does not show the refraction. Answer: c Explanation: Convex mirror does not form real focus. Using two pin method, determine the focal length of the convex lens f 1 and the focal length of the combination F. This happens when the rays retrace their path, i. . The main focus of this event was to create awareness of the white privilege that exists in America and to begin to dismantle the system that has been built to up lift white people and oppress people of color.

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## PhysicsLAB: Determining the Focal Length of a Converging Lens Answer: Concave mirror is used as shaving mirror or in vanity boxes because it gives magnified, virtual and erect image. For this purpose the lens is put very close to the eye in between the eye and the object to be magnified. So what causes Focal Dystonia. If the lens were thick then the nature of the image formed will be the same but focal length will be different. To find the focal length of a concave lens using a convex lens Aim To find the focal length of a concave lens using a convex lens. Question 12: Image formed by a convex mirror is always: a real and diminished b real and magnified c virtual and diminished d virtual and magnified. Does power depend upon aperature of a lens? How To Set Up 1.

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## NCERT Class 10 Science Focal Length of Concave Mirror and Convex Mirror And in every part of the experiment, the sharpest image was located and all pertinent measurements was recorded. Formation of image in diverging lens double concave Unlike in the positive lens, the image formed in the diverging lens is virtual as determined graphically. Convex mirrors reflect light outwards; therefore they are not used to focus light. They are therefore reflected back through the lens and brought to a focus in the same plane as the object. I will keep the bulb brightness the same all through out the experiment. Answer: Concave mirror and convex mirror. The equivalent focal length was calculated using Equation 1.

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## Determining Focal Lengths of Concave and Convex Lenses Question 20: How will you distinguish a concave lens from a convex lens experimentally? Plane and convex mirrors form such a virtual image. In this experiment the lens is first placed at L1, between the and the illuminated. Answer: In reflector type solar cooker, the position of food vessel should be at the focus of concave mirror. Two convex lenses were mounted on the optical bench at the same time for the next part, wherein the object-to-convex lens 1 distance is less than the theoretical focal length of the said lens and that the two lenses were not in contact. For the first part, convex lens 1 and convex lens 2 were used at different times but same setup wherein the object-to-lens distance is greater than the theoretical focal length of the used lens. If necessary, the tilt of the mirror should be adjusted until the tip of the image is at the same level as the tip of the pin.

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## Concave Lens The object used in this experiment consists of a hole cut in a white screen made of sheet metal and illuminated from behind by a pearl electric lamp. Measurement of object and image distances. The current us always the same in all parts of a series circuit. Under what condition, the nature of lens change? Answer: A concave lens always forms erect and virtual image of the object. Asif Ishaq results at higher object distances, resulting in a greater distribution of results at lower object distances.

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## PhysicsLAB: Determining the Focal Length of a Converging Lens When this has been done both object and image are at the same distance from the To measure the focal length of a concave mirror mirror, and hence both must be situated in a plane passing through the centre of curvature and at right angles to the axis. Now place the lens somewhere close to the illuminated object where the object comes into focus on the screen. The ray diagram of a convex mirror is shown below. Question 24: For finding the focal length of a concave mirror, where do we keep the object? The distance between the mirror and the screen is measured; which is equal to focal length of the mirror. The image is formed at F point of the mirror.

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## Convex Mirror The concave mirror is supported vertically in a suitable holder, and a pin, stuck in a cork held in a clamp and stand, is adjusted so that the tip of the pin is at the same level as the centre of the mirror. V Adjust the position of the lens to form a sharp image. This will be indirect distribution. The relationship of the values of and from Trial 1 and Trial 2 can also be observed in Trial 3 and 4 for both convex lens 1 and 2. An object is placed at 20 cm from the pole of this lens. The focal length of a convex mirror can be determined by introducing a convex lens between the object and the convex mirror. It can be observed that the value calculated was exactly equal to the theoretical focal length of the concave lens, making the experimental value of the focal length of the concave lens in Table W4 valid.

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## NCERT Class 10 Science Focal Length of Concave Mirror and Convex Mirror Answer: Concave mirror will form a virtual image when the object is placed between pole and the focus. Image formed by a convex lens is generally real and inverted and on bringing the object near the lens the size of image goes on increasing. How chromatic aberration can be minimized? The actual value told is 10. On which structure we get the image? The image formed was inverted and reduced. Before reporting your focal length values in the chart below, remember to reproportion them to the original size of the optical bench's measurements.

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