Physics
Grade-10
Easy
Question
A concave lens is of radius of curvature 94 cm. A parallel beam of light shone on the lens appears to diverge from a point at a distance of ____ cm from the optic center.
Hint:
For a concave lens, its focal length will be half of the radius of curvature. i.e f= R/2
The correct answer is: 47
A concave lens is of radius of curvature 94 cm. A parallel beam of light shone on the lens appears to diverge from a point at a distance of 47 cm from the optic center.
- A concave lens diverges the rays of a parallel beam away from the normals.
- The rays are appeared to be diverged from a point known as focus.
- This distance of the focus from the optical center is the focal length.
- When the radius of curvature is 94 cm, its focal length will become half of its radius.
- As the f= R/2, the rays appears to be diverge from 94/2= 47cm from the optic center.
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