Q. No.1. \(\text{-}5.5~\text{cm}\)
2. \(\text{-}6.5~\text{cm}\)
3. \(\text{-}7.5~\text{cm}\)
4. \(8.5~\text{cm}\)
1. \(15~\text{cm}\)
2. \(25~\text{cm}\)
3. \(35~\text{cm}\)
4. \(30~\text{cm}\)
A mobile phone lies along the principal axis of a concave mirror, as shown in the figure. Then,
| 1. | the magnification is not uniform due to the length of the object along the principal axis. |
| 2. | the distortion of the image depends on the location of the phone with respect to the mirror. |
| 3. | both (1) and (2) |
| 4. | none of these |
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A convex mirror of focal length \(20~\text{cm}\) forms an image that is a quarter of the object's size. The distance of the object from the mirror is:
1. \(50~\text{cm}\)
2. \(-60~\text{cm}\)
3. \(-40~\text{cm}\)
4. \(-70~\text{cm}\)
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| 1. | at the focus of the mirror |
| 2. | at the centre of the curvature |
| 3. | between pole and focus |
| 4. | between focus and centre of curvature |
A small candle, \(2.5\) cm in size is placed at \(27\) cm in front of a concave mirror of radius of curvature \(36\) cm. At what distance from the mirror should a screen be placed in order to obtain a sharp image?
| 1. | \(54\) cm away from the mirror |
| 2. | \(64\) cm towards the mirror |
| 3. | \(40\) cm away from the mirror |
| 4. | \(44\) cm towards the mirror |
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1. \(f=+\dfrac{1}{2}r\)
2. \(f=-r\)
3. \(f=-\dfrac{1}{2}r\)
4. \(f=r\)
| (A) | Convex lens |
| (B) | Concave lens |
| (C) | Convex mirror |
| (D) | Concave mirror |
Choose the correct option from the given ones:
| 1. | (A), (B) and (C) only |
| 2. | (A) and (B) only |
| 3. | (B) and (C) only |
| 4. | (B), (C) and (D) only |
A candle is held \(3\) cm away from a concave mirror of focal length \(12\) cm, then the nature of the image formed by the mirror is:
1. real, inverted
2. virtual, erect
3. real, erected
4. virtual, inverted
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| 1. | \(1\) | 2. | \(2\) |
| 3. | \(3\) | 4. | \(4\) |
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