When a negatively charged rod is brought near the cap of a charged gold leaf electroscope which has positive charges, the leaf?
A. Remains the same B. Collapses C. Collapses and diverges again D. Diverges Correct Answer: Option B – Collapses
When a telescope is in normal use; the final image is at?
A. Infinity B. The focus C. The radius of curvature D. The near the point Correct Answer: Option A – Infinity
In a compound microscope; the objective and the eye piece focal lengths are?
A. At infinity B. Long C. Short D. The same Correct Answer: Option C – Short
The focal length of a concave mirror is 2.0cm. If an object is placed 8.0cm from it; the image is at?
A. 2.7m B. 2.0m C. 2.3m D. 2.5m Correct Answer: Option A – 2.7m Explanation 1/U+1/V=1/f 1/8+1/V=1/2 V = 8/3 V = 2.7cmProducts
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