NEET: #5 | Lateral Magnification & Related Topics

A concave mirror of focal length \(100\) cm is used to obtain the image of the sun which subtends an angle of \(30'.\) The diameter of the image of the sun will be:
1. \(1.74\) cm
2. \(0.87\) cm
3. \(0.435\) cm
4. \(100\) cm

53%

Level 3: 35%-60%

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Hints

A square of side \(3\) cm is placed at a distance of \(25\) cm from a concave mirror of focal length \(10\) cm. The centre of the square is at the axis of the mirror and the plane is normal to the axis. The area enclosed by the image of the square is:

1.	\(4~\text{cm}^2 \)	2.	\(6~\text{cm}^2 \)
3.	\(16~\text{cm}^2 \)	4.	\(36~\text{cm}^2 \)

58%

Level 3: 35%-60%

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Links

In an experiment of find the focal length of a concave mirror a graph is drawn between the magnitudes of u and v. The graph looks like

1.		2.
3.		4.

65%

Level 2: 60%+

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Hints

As the position of an object \((u)\) reflected from a concave mirror is varied, the position of the image \((v)\) also varies. By letting the \(u\) change from \(0\) to infinity, the graph between \(v\) versus \(u\) will be: