Question

Short Answer Type Questions
11. An object is placed at a distance of 10 cm from a concave mirror of focal length 20 cm.
(a) Draw a ray diagram for the formation of image.
(b) Calculate the image distance.
(c) State two characteristics of the image formed.
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Answer 1

Explanation:

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Answer 2

Explanation:

Explanation:Focal length of concave mirror, f = -20 cm

Explanation:Focal length of concave mirror, f = -20 cmDistance of object from the mirror, u = -10 cm

Explanation:Focal length of concave mirror, f = -20 cmDistance of object from the mirror, u = -10 cmuse formula, 1/v + 1/u = 1/f

Explanation:Focal length of concave mirror, f = -20 cmDistance of object from the mirror, u = -10 cmuse formula, 1/v + 1/u = 1/f or, 1/v = 1/f - 1/u

Explanation:Focal length of concave mirror, f = -20 cmDistance of object from the mirror, u = -10 cmuse formula, 1/v + 1/u = 1/f or, 1/v = 1/f - 1/u or, 1/v = 1/-20 - 1/-10

Explanation:Focal length of concave mirror, f = -20 cmDistance of object from the mirror, u = -10 cmuse formula, 1/v + 1/u = 1/f or, 1/v = 1/f - 1/u or, 1/v = 1/-20 - 1/-10 or, 1/v = -1/20 + 1/10 = 1/20

Explanation:Focal length of concave mirror, f = -20 cmDistance of object from the mirror, u = -10 cmuse formula, 1/v + 1/u = 1/f or, 1/v = 1/f - 1/u or, 1/v = 1/-20 - 1/-10 or, 1/v = -1/20 + 1/10 = 1/20 or, v = +20cm

Explanation:Focal length of concave mirror, f = -20 cmDistance of object from the mirror, u = -10 cmuse formula, 1/v + 1/u = 1/f or, 1/v = 1/f - 1/u or, 1/v = 1/-20 - 1/-10 or, 1/v = -1/20 + 1/10 = 1/20 or, v = +20cm hence, image position is the 20cm right side from the pole of the concave mirror as shown in the diagram. The image is straight and bigger than the object.