Radius of curvature<span> of a spherical mirror = 2 × </span>Focal length<span>
and the ray of light is parallel to the principle axis if the incident </span><span>Passes through focus
therefore, focal length =30/2=<span>15cm
</span></span><span>The mirror should be placed at a distance of 15cm from the light bulb to produce this parallel light beam.</span>
Technically, it's a wedge choice letter D.
Okie so I can see it on tomorrow morning lol lol
I believe the answer is A.
Explanation:
I need more info to this question A steel ball can have a different mass depending on the desity.