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Reflection

Reflection of...

Question

Reflection of the mirror gives us ___ images.

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Solution

A plane mirror is a smooth surface that reflects the entire light that is incident on it from the object.
When this reflected light falls into our eyes, we can see the image of the object.
Because of this complete reflection of light, we can see the entire image clearly.

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Q. State whether the following statements are true or false. Rewrite the false statements correctly.
(a) The laws of reflection hold good only for plane mirrors and not for spherical mirrors.
(b) The radius of curvature is double the focal length of a concave mirror.
(c) A ray passing through the focus cuts through the principal axis of a concave mirror after reflection.
(d) When an object is placed between a concave mirror and its focus, the image formed is virtual, erect and larger than the object.
(e) The image formed on a cinema screen is virtual.
(f) A convex mirror is used by stage artists.
(g) A convex mirror always gives real images.
(h) A pinhole camera gives a real image.
(i) A convex surface bulges inwards.
(j) Incident rays parallel to the principal axis of a curved mirror pass through the focus after reflection.
(k) A concave mirror always forms a real image.
(l) There can be many reflected rays for a single incident ray falling on a reflecting surface.

An object 20 cm from a spherical mirror gives rise to a virtual image 15 cm behind the mirror. Determine the magnification of the image and the type of mirror used.

Q. Fill in the blanks using the correct word given in the bracket:
1. Light is a form of ............................ . (energy/electricity)
2. All bodies which emit light energy by themselves are called ............................ bodies. (luminous/opaque)
3. Light travels in a ............................ line. (straight/curved)
4. A glowing electric bulb is an example of ............................ source of light. (natural/artificial)
5. Any polished surface from which regular reflection takes place is called a ............................ . (mirror/obstacle)
6. Reflection from a mirror gives clear ............................ . (image/shadow)
7. The shadow of a coloured object is ............................ . (coloured/black)
8. The image formed by a mirror is due to ............................ of light. (reflection/ propagation)

Q. (a) A wall reflects light and a mirror also reflects light. What difference is there in the way they reflect light?
(b) Which type of reflection of light leads to the formation of images?

Q. A ______ uses mirrors to produce images using multiple reflection property.

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