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प्रश्न
What is a spherical mirror? Distinguish between a concave mirror and a convex mirror.
उत्तर
A spherical mirror is a curved surface in which the inner or outer surface has the capability to reflect light.
Difference between convex and concave mirror are as follows:
| Convex Mirror | Concave Mirror |
| 1.In a convex mirror, reflection of light takes place on the bulged-out surface. |
1.In a concave mirror, reflection of light takes place on the bent surface . |
| 2. Convex mirror has virtual focus. | 2. Concave mirror has real focus. |
| 3. Convex mirror diverges the rays of light incident on it. | 3. Concave mirror converges the rays of light incident on it. |
APPEARS IN
संबंधित प्रश्न
State two positions in which a concave mirror produces a magnified image of a given object. List two differences between the two images.
Draw ray diagrams to show the principal focus of a convex mirror.
A student wants to project the image of a candle flame on the walls of the school laboratory by using a mirror.
(a) Which type of mirror should he use and why?
(b) At what distance, in terms of focal length 'f' of the mirror, should he place the candle flame to get the magnified image on the wall?
(c) Draw a ray diagram to show the formation of the image in this case.
(d) Can he use this mirror to project a diminished image of the candle flame on the same wall? State 'how' if your answer is 'yes' and 'why not' if your answer is 'no.'
A ray of light is incident on a plane mirror making an angle of 90° with the mirror surface. The angle of reflection for this ray of light will be:
(a) 45°
(b) 90°
(c) 0°
(d) 60°
Giving reasons, state the 'signs' (positive or negative) which can be given to the following:
(a) object distance (u) for a concave mirror or convex mirror
(b) image distance (v) for a concave mirror
(c) image distance (v) for a convex mirror
One of the following does not apply to a concave mirror this is:
(a) focal length is negative
(b) image distance can be positive or negative
(c) image distance is always positive
(d) height of image can be positive or negative
If the object is moved further away from the mirror, what changes are there in the position and size of the image?
The diagram shows a dish antenna which is used to receive television signals from a satellite. The antenna (signal detector) is fixed in front of the curved dish.
Figure
(a) What is the purpose of the dish?
(b) Should it be concave or convex?
(c) Where should the antenna be positioned to receive the strongest possible signals?
(d) Explain what change you would expect in the signals if a larger dish was used.
A _____________ mirror is used by a dentist.
Concave mirrors are used by dentists to examine teeth. Why?
