Which of the following statements is/are true about the principal axis of a spherical mirror?
(i) It is normal to the mirror
(ii) Point of incidence always lies on the principal axis
(iii) Principal focus always lies on the principal axis
The correct answer is option (b) Both (i) and (iii)
Statement (i) is true because the principal axis is perpendicular (normal) to the mirror at the pole.
Statement (iii) is true because the principal focus is always on the principal axis.
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The focal length of a small concave mirror is 2.5 cm. In order to use this concave mirror as a dentist's mirror, the distance of tooth from mirror should be
When an object is placed at the centre of curvature in front of a concave mirror, the characteristics of the image formed are:
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If an image formed after reflection from a mirror is virtual and high diminished, then the position of the object and type of mirror is:
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Suppose Ram has placed a ball in front of a concave mirror of focal length (f )at various distances (u) and he has measured the corresponding image distances (v). From the values of u and v, Ram is able to plot a graph of 1/v against 1/u. From the graph, Ram has observed that x intercept and y intercept are 0.1" " cm and 0.11" " cm, respectively. Then the focal length of the mirror is:
An object of height 3 cm is placed at a distance 30 cm in front of a convex lens of focal length 20 cm. The height of the image will be:
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