Question

An object is a situated at a distance of 20cm from concave mirror. Find the nature and position of the image. If focal length is 15cm?

Answer 1

Answer:

Ray diagrams can be used to determine the image location, size, orientation and type of image formed of objects when placed at a given location in front of a concave mirror. The use of these diagrams was demonstrated . Ray diagrams provide useful information about object-image relationships, yet fail to provide the information in a quantitative form. While a ray diagram may help one determine the approximate location and size of the image, it will not provide numerical information about image distance and object size.

To obtain this type of numerical information, it is necessary to use the

Answer 2

Answer:

given,

object distance u=20cm

focal length f =15cm

image distance =?

1/f=1/v-1/u

1/15=1/v-1/20

1/v=1/20-1/15

1/v=1/5

v=5cm

Explanation:

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