Q. No.A tall man, of height 6 feet, wants to see his full image. The required minimum length of the mirror will be:
| 1. | 12 feet | 2. | 3 feet |
| 3. | 6 feet | 4. | Any length |
Two plane mirrors, A and B are aligned parallel to each other, as shown in the figure. A light ray is incident at an angle of at a point just inside one end of A. The plane of incidence coincides with the plane of the figure. The maximum number of times the ray undergoes reflections (excluding the first one) before it emerges out is:
1. 28
2. 30
3. 32
4. 34
Light of wavelength 5000 Å falls on a plane reflecting surface. For what angle of incidence is the reflected ray normal to the incident ray?
1. \(37^{\circ}\)
2. \(45^{\circ}\)
3. \(90^{\circ}\)
4. \(0^{\circ}\)
A plane mirror approaches a stationary person with acceleration of 10 ms–2. The acceleration of his image as seen by the person, will be:
| 1. | 10 m/s2 |
| 2. | 20 m/s2 |
| 3. | 5 m/s2 |
| 4. | can't be determined |
A point source of light B is placed at a distance L in front of the centre of a mirror of width d hung vertically on a wall. A man walks in front of the mirror along a line parallel to the mirror at a distance 2L from it as shown. The greatest distance over which he can see the image of the light source in the mirror is:
1. d/2
2. d
3. 2d
4. 3d
A car is moving on a straight road at a speed of 50 km/h and a truck is ahead of the car and has a large plane mirror fixed vertically on the back of the truck. The truck is running at a speed of 70 km/h. For a stationary observer standing between the car and the truck, what is the speed of the image of the car in the mirror?
| 1. | 40 km/h | 2. | 70 km/h |
| 3. | 20 km/h | 4. | 90 km/h |
Image formed by a plane mirror is:
| 1. | real |
| 2. | virtual |
| 3. | depends on the nature of the object |
| 4. | none of these |
An object is placed 20 cm in front of a concave mirror of a radius of curvature 10 cm. The position of the image from the pole of the mirror is:
1. 7.67 cm
2. 6.67 cm
3. 8.67 cm
4. 9.67 cm
An object is at a distance of 30 cm in front of a concave mirror of focal length 10 cm. The image of the object will be:
| 1. | smaller in size. |
| 2. | inverted. |
| 3. | between the focus and centre of curvature. |
| 4. | All of the above. |
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