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4 years ago

A concave mirror has a focal length of 20 cm.

Physics

1 answer:

____ [38]4 years ago

4 0

Answer:

Explanation:

a )

focal length of mirror = 20 cm

a ) radius of curvature = 2 x focal length = 2 x 20 = 40 cm

b )

c ) object distance u = 15 cm

image distance v = ?

focal length f = 20 cm from the formula

$\frac{1}{v} + \frac{1}{u} = \frac{1}{f}$

$\frac{1}{v} + \frac{1}{- 15} = \frac{1}{-20}$

v = + 60 cm

So image is magnified . It will be formed on the other side of the mirror .It will be virtual .

d )

The image is magnified when object is placed between 2 f and f or between centre of curvature and focal length . In this case image is real and magnified . The image is magnified when object is placed between focal length and the pole . In this case image is virtual .

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