Physics
The lens of power + 1.0 D is:
- convex of focal length 1.0 cm
- convex of focal length 1.0 m
- concave of focal length 1.0 cm
- concave of focal length 1.0 m.
Related Questions
If a lens deviates a ray towards its centre, its power is …………… and if it deviates the ray away from its centre, its power is ……………
- positive, positive
- negative, negative
- negative, positive
- positive, negative
On reducing the focal length of a lens, its power :
- decreases
- increases
- does not change
- first increases then decreases.
The power of a concave lens of focal length 20 cm is :
- 5D
- 10D
- -10D
- -5D