What type of mirror is used as shaving mirror or in vanity boxes? Yes, it forms virtual image only when placed between focus and optical centre and for all other positions it forms real image. Answer: Convex mirror is a diverging mirror so it does not form a real focus. (a) R = infinity To determine the focal length of the given concave mirror we need to measure the distance between: Answer: An object is placed at ‘C’, i.e., centre of curvature of a concave mirror. (a) Virtual, inverted, diminished image in red shade Add all the focal lengths found out and find the mean value of the focal length of the convex lens. Rules for Obtaining Image Formed By Concave Mirror, To Determine The Focal Length Of Concave Mirror Practical. Answer: Answer: Answer: Concave mirror is used as shaving mirror or in vanity boxes because it gives magnified, virtual and erect image. Question 35: Explanation: A ray of light passing through the focus of a concave mirror becomes parallel to the principal axis after reflection, as shown in figure (iii). Question 16: (II) Measure the distance between the lens and the screen. The rays always converge by a convex lens and is called converging lens. (b) concave, plane, convex mirror The focal length of the given concave mirror = 10 cm, Focal Length Of Convex Lens Experiment Class 10. What is the law of reflection for mirror? Select a distant object from the laboratory window (distance should be more than 50 ft). (i) The incident ray, the reflected ray and the normal, all lie in the same plane. The top part is a concave mirror, the middle part is a plane miiTor and the bottom part is a convex mirror. Different paths of ray are shown in the following figures. The focal length is half the radius of curvature. (IV) Place a screen opposite to the object on the lab table. (c) (b) remains parallel but deviates Explanation: (a) any spherical mirror (b) concave mirror To find the focal length of a convex mirror, using a convex lens. 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(d) screen and the object and also mirror and the screen object, then the mirror is Mean value of focal length of convex lens =, Result Answer: Measure the distance between the concave mirror and the screen with a metre scale. Question 9: Positive, since it converges light. (a) ‘f’ is always positive (b) ‘f’ is always negative Answer: (d) beyond C. Answer: Explanation: The polished surface of the concave mirror must face the distant object. (d) real, inverted and enlarged. Explanation: A concave mirror, a measuring scale, a screen a mirror holder and mirror stand. Question 17: A sharp image of a distant object is obtained on a screen using a convex lens. A large sized object placed at a far off (Infinity) place, seen from the window of the lab, is taken as object. (b) R=f/2 (c) plane, concave and convex mirror Concave mirror forms a highly diminished sized, real and inverted image of the object at ‘F’ point which can be taken on the screen. (a) at C (b) beyond C A ray of light parallel to principal axis of a concave mirror, passes through its focus after reflection from the mirror as shown in figure (i). Question 44: The image is formed at F point of the mirror. What is the mirror formula? (c) R = 2f Image will be formed, as usual but the intensity will be reduced to half the original. Answer: The image of the building is obtained on a wall which is painted white Procedure. Explanation: A spherical mirror, whose reflecting surface is curved inwards. (d) The device X is a convex lens of focal length 40 cm. The light rays after reflection appear to diverge from a point.
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