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Damm [24]
4 years ago
7

A glowing electric light bulb placed 15 cm from a concave spherical mirror produces a real image 8.9 from the mirror. the light

bulb is moved to a position 20cm from the mirror
a) what is the image position? (answer with -1000 if the image does not exist)
Physics
1 answer:
marta [7]4 years ago
5 0

Answer:

The image will form at distance d = 7.75 cm from the mirror

Explanation:

As we know that the bulb is placed at 15 cm distance from the concave mirror

Then the image will form at distance d = 8.9 cm

now we have

\frac{1}{d_i} + \frac{1}{d_0} = \frac{1}{f}

so we have

\frac{1}{8.9} + \frac{1}{15} = \frac{1}{f}

f = 5.58 cm

Now when bulb is placed at distance 20 cm from the mirror

then again we have

\frac{1}{d_i} + \frac{1}{d_0} = \frac{1}{f}

\frac{1}{d_i} + \frac{1}{20} = \frac{1}{5.58}

now we have

d_i = 7.75 cm

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