1. The focal length and the type of lens whose power is +2.0 D is (1)
(a) +0.20 m and concave lens
(b) +0.20 m and convex lens
(c) +0.50 m and concave lens
(d) +0.50 m and convex lens
Answers
Answer:
Focal length f= 1/p So according to the question power is +2.0 D f= 1/2.0 = 0.5 m In centimeter ...the focal length is 50cm. it means that it is biconvex lens having focal length 50 cm.
The focal length and the type of lens whose power is +2.0 D is +0.50 m and convex lens
Explanation:
Power of lens = 1/ focal length in meter.
Therefore,
f = 1/P
Power = +2.0
f = 1/2
f = 0.5
Hence,
A convex lens has a positive focal length. Therefore, it is a convex lens.
Power of lens:
The degree of convergence or divergence of the light rays hitting a lens is measured by its power.
The focal length of the lens determines how much convergence or divergence occurs.
As a result, we define the lens' power as the focal length times its reciprocal. It's stated as,
Lens power (P) equals 1/f
where f is the lens's employed focal length.
The SI unit of power is a dioptre (D).
Convex lenses have a potential for positive power, whilst concave lenses have a potential for negative power.
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