an optical device has been given to a student and he determines its focal length by focusing the image of a sun on a screen placed 24 centimetre from the device on the same side of the name the optical device and find its focal length
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The answer is option three that is the concave mirror of focal length 24.
A concave mirror is a design with a reflecting surface at one turn which is covered on either inner or inner side. I
t is also known as a circulation mirror because this reflective surface combines the light incident on its surface and reflects the parallel rays of light towards a normal focus.
It is made from a circular interior that is quieter on the inside. In this Knowledge article, we become familiar with some of the uses of a concave mirror.
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