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प्रश्न
Define the term Principle axis.
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उत्तर
The principal axis is the straight line passing through the pole and the centre of curvature.
संबंधित प्रश्न
Draw diagrams to show the difference between regular and irregular reflection.
An object 3 cm high produces a real image 4.5 cm high when placed at a distance of 20 cm from a concave mirror. Calculate:
- the position of image
- focal length of the concave mirror.
You are provided a convex mirror, a concave mirror and a plane mirror. How will you distinguish between them, without touching or using any other apparatus?
In the figure is shown a concave mirror. A is a point on the principal axis. If an object O is kept at A, image is formed on A itself. Copy the diagram. Draw the image in the diagram. Is the image real or virtual?
Measure the distance PA and write it in the diagram. What is the distance PA called?
Mark a point B on the principal axis, at which, if a point source of light is kept, the rays travel parallel to principal axis after reflection from M. What is point B called?
What is reflection of light?
A ray of light is travelling in a direction perpendicular to the boundary of a parallel glass slab. The ray of light ______.
Which material is transparent?
Part of the eye which controls the light entering is called
The image formed by a plane mirror is always as far behind the mirror as far the object lies in front of it.
What kind of surface reflects light?
