Correct Answer: (a) a is only correct
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90 Mins English English100 Questions100 Marks90 Mins English English100 Questions100 Marks90 Mins EnglishAstigmatism is corrected by the use of which lens?
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:
The radius of curvature of a plane mirror is
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:
Magnification produced by a spherical mirror is equal to:
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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