Physics
If a lens is placed in water instead of air, its power :
- increases
- decreases
- remains the same
- can both increase or decrease
Refraction Lens
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Answer
decreases
Reason — A lens bends light less in water than in air because water and glass have similar refractive indices. This makes the focal length longer and the power of the lens decreases.
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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.
Linear magnification m is given by :
- m = vu
- m = -
- m =
- m =
The focal length of a lens is (i) positive, (ii) negative. In each case, state the kind of lens.
What information about the nature of the image (i) real or virtual, (ii) erect or inverted, do you get from the sign of magnification + or - ?