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प्रश्न
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उत्तर
Focal length = 1/2 of radius of curvature
= 1/2 X 30 = 15cm.
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संबंधित प्रश्न
Select the correct alternative
The angle between the incident ray and the ray reflected from the plane mirror is 70°. The angle of incidence will be :
Draw a diagram to show the reflection of a light ray incident normally on a plane mirror.
The image formed by a plane mirror is :
How many images are formed for a point object kept in between two plane mirrors at right angles to each other? Show them by drawing a ray diagram.
In the barber's shop, two plane mirrors are placed :
An object is placed (i) asymmetrically (ii) symmetrically, between two plane mirrors inclined at an angle of 50°. Find the number of images formed.
Explain the following term:
Normal Draw
diagram/diagrams to show them.
Prove geometrically that when plane mirror turns through a certain angle, the reflected ray turns through twice the angle.
Parallel rays are incident:
- on regular surface and
- on irregular surface. In what respect do reflected rays in (1) differ from those of (2)?
