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 theformation of the image.
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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 theformation of the image.
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10th
General Knowledge
Basic Science
Basic Physics
An object is placed at a di...
GENERAL KNOWLEDGE
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Asked on December 26, 2019 by
Sweeti Singhal
An object is placed at a distance of 10 cm from a concave mirror of focal length 20 cm.
a) Draw ray diagram for the formation of image
b) Calculate the image distance
c) state 2 characteristics of the image formed.
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ANSWER
Given:
Focal length of concave mirror, f = -20 cm
Distance of object from the mirror, u = -10 cm
use 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.