light from a distant planet is incident on a converging mirror. the image of the planet forms on a screen is 45cm from the pole of the mirror find the focal length of the mirror
Answers
Given : light from a distant planet is incident on a converging mirror. the image of the planet forms on a screen is 45cm from the pole of the mirror.
To find : we know, when a parallel beam of lights strikes the surface of converging mirror, after reflection it cuts the principal axis at a point which is known as Focus and distance between focus to pole is focal length.
here light from a distant planet is incident on a converging.
means, light comes from infinite so, after reflection on the surface of mirror, it passes through the focus.
as the image of the planet forms on a screen is 45cm from the pole of the mirror. focal length of converging mirror = 45cm
Therefore focal length of converging mirror , f = - 45cm
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