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प्रश्न
Suppose you have three concave mirrors A, B and C of focal lengths 10 cm, 15 cm and 20 cm. For each concave mirror you perform the experiment of image formation for three values of object distance of 10 cm, 20 cm and 30 cm. Giving reason answer the following:
(a) For the three object distances, identify the mirror/mirrors which will form an image of magnification – 1.
(b) Out of the three mirrors identify the mirror which would be preferred to be used for shaving purposes/makeup.
(c) For the mirror B draw ray diagram for image formation for object distances 10 cm and 20 cm.
उत्तर
(a) In case of concave mirror, a real and inverted image of same size is formed as that of object, when object is placed at a distance of 2F (R). Hence, in case of mirror A when object is placed at 20 cm , and in case of mirror B, when object is placed at 30 cm, the image formed will be of same size as that of object. Thus, magnification in both these cases will be −1.
(b) The mirror C, with focal length of 20 cm will be preferred to be used for shaving purposes/makeup. As within this focal length, enlarged and erect image will be formed.
(c)
(i) When the object is at 10 cm from the mirror
(ii) When the object is at 20 cm from the mirror
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संबंधित प्रश्न
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| A | B | C | D |
