Answer the following questions: An equiconvex lens forms a full size magnified image of a candle…
Answer the following questions:
(i)
An equiconvex lens forms a full size magnified image of a candle flame on a screen. How will this image change, if at all, when the lens is cut horizontally into two equal parts and only one of them is used? Explain.
(ii)
State what happens to magnifying power of a simple microscope if its focal length is decreased.
Answer
Answer (i)
AIWritten by AI (gemini) - it can contain mistakes.
The nature, size, and position of the image will remain completely unchanged because cutting the lens horizontally does not change its radius of curvature or focal length. However, the brightness (intensity) of the image will be reduced to half because the aperture area is halved, collecting only half the light.
Answer (ii)
AIWritten by AI (gemini) - it can contain mistakes.
The magnifying power of a simple microscope increases when its focal length is decreased, since $M = 1 + \frac{D}{f}$ (or $M = \frac{D}{f}$ at infinity), showing that $M$ is inversely proportional to $f$.
From ISC 2027 Specimen Physics Paper 1, question 15.