Chapter 11 Reflection of Light
- When a person stands in front of a plane mirror, how is the image formed? What is the nature of the image? The image of a person is formed from every point of the source, thereby forming an extended image of the whole source. The image formed woul... 1
- Which letters of the English alphabet form images that look the same as the original letters? A, H, I, M, O, T, U, V, W, X, Y 2
- If we hold a page of a book in front of a mirror, we see laterally inverted letters in the mirror. Why does it happen? When we hold a page of a book in front of the mirror, the image of the words appear laterally inverted. The image of every point of the word... 1
- difference between Principal Focus of Concave and Convex Mirror. Principal Focus of the Concave Mirror Principal Focus of the Convex Mirror (i) Incident rays which are parallel to the principal axis of a c... 1
- What is a mirror ? A mirror is a reflecting surface which reflects light and creates clear images. 2
- What is light ? Light is a form of electromagnetic radiation that produces the sensation of vision. 2
- Three mirrors are created from a single sphere. Which of the following- pole, center of curvature Three mirror created from single sphere Centre of curvature and Radius of curvature will be common for all three pieces. Pole and Principal... 1
- A 10cm long stick is kept in front of a concave mirror having focal length of 10cm in a such Given that, For concave mirror For end A: Focal length f= -10cm Object distance u = -30cm We know that, the mirrors formula is given by, 1/f... 1
- A convex mirror has a focal length of 18cm. The image of an object kept in front of the mirror is half the height of Given that, For convex mirror, Focal length f= 18cm And h2= h1/2 Hence, h2/h1 = 1/2 We know that, magnification is given by, m= h2/h1 = -v/u... 1
- An object of height 7cm is kept at a distance of 25cm in front of a concave mirror. The focal length of the mirror is Given that, For concave mirror, Object height h1= 7cm Object distance u= -25cm Focal length f= -15cm We know that, the mirrors formula is gi... 1
- Which type of mirrors are used in the following. Periscope, floodlights, shaving mirror, kaleidoscope, street lights In periscope plane mirror is used. In floodlights and shaving mirror the concave mirror is used. In kaleidoscope also plane mirror is used.... 1
- Draw the ray diagram for the cases of images obtained in concave mirror as described in the table on page 122. (a) A ray diagram for object at infinity for a concave mirror. Object at infinity for a concave mirror Image position Nature of image At foc... 1
- What sign conventions are used for reflection from a spherical mirror? According to the Cartesian sign convention, the pole of the mirror is taken as the origin. The principal axis is taken as the X-axis of the... 1
- If a spherical mirror breaks, what type of the mirrors are the individual pieces? After breaking of the spherical mirror there will be no change in the nature of the mirror. That means if the concave mirror is broken into... 1
- Why does obtaining the image of the sun on a paper with the help of a concave mirror burn the paper? We know that, when a parallel beam of light which may parallel to principal axis is incident on the concave mirror then after reflection the... 1
- Why are the mirrors fitted on the outside of the cars are convex? We know that, convex mirror always produces virtual and diminished image of the object which covers the wider field of view. As the mirrors... 1
- Why are concave mirrors are used in solar devices? We know that, when a parallel beam of light which may parallel to principal axis is incident on the concave mirror then after reflection the... 1
- Describe the positions of the source of light with respect to a concave mirror in torch light, projector lamp Torch light: In torch light concave mirror is used and the source of light is placed at the focus of the concave mirror so that after reflec... 1
- Explain the difference between plane mirror, a concave mirror and a convex mirror with respect to the type and size Plane mirror: The image formed in a plane mirror is virtual and erect. And the size of the image produced is same as the size of the object.... 1