Physics
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
Refraction Lens
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Answer
positive, negative
Reason — If a lens deviates a ray towards its centre, its power is positive and if it deviates the ray away from its centre, its power is negative. Hence, power of convex lens is positive and that of concave lens is negative.
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Related Questions
If the magnification produced by a lens is -0.5, the correct statement is:
- the lens is concave
- the image is virtual
- the image is magnified
- the image is real and diminished formed by a convex lens
The numerical value of magnification m is always …………… for a concave lens.
- equal to 1
- less than 1
- more than 1
- variable
On reducing the focal length of a lens, its power :
- decreases
- increases
- does not change
- first increases then decreases.
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.