Question

A point sized image of a distant tree is formed at a distance of 10cms from a concave mirror. Find the image distance of another object placed 20 cms in front of the same concave mirror.​

Answer 1

Explanation:

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.

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Answer 2

Answer:

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