Question

3. Aryan, a student of class X using a mirror brought sunlight in the form of a sharp spot of light on a
black paper. The black paper begins to burn after some time.
Now, answer the following questions
3.1 Name the type of mirror used by Aryan.
3.2 What is the distance between the mirror and the spot of light?
3.3 Name the center of the reflecting surface of this mirror.
3.4 What is the sign of the focal length of this mirror?​

Answer 1

Answer:

ans

Explanation:

3.1 concave mirror

3.2 12 cm

3.3 sunlight

3.4 x

Answer 2

Answer:

1. Concave Mirror
2. The distance between the mirror and the spot of light is equal to the focal length (f) of the concave mirror.
3. Pole(P)
4. f = PF

Explanation:

1. The type of the mirror that is used by Aryan is Concave Mirror. The spherical surface of concave mirror converges the parallel incident rays coming from sun which is at infinite distance and focuses the parallel rays at a certain point that is called Focus Point (F).
2. The distance between the mirror and the spot of light is equal to the focal length (f) of the concave mirror.
3. The reflecting surface of the concave mirror is Spherical and the midpoint or centre of the surface is called Pole that is represented as P point. (As shown in the figure)
4. The sign of the focal length of this mirror is usually represented by f. And the focus point is represented by F . The distance between pole and focus point is equal with the focus length (f) i.e; f = PF (As in the figure)

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