A lens has a power of +0.5 D. It isa)a concave lens of focal length 5 ...
Given, power of the lens = 0.5 D.
We know that the power of the lens is given by the formula:
Power (P) = 1/f, where f is the focal length of the lens.
Therefore, we can write:
0.5 D = 1/f
Solving for f, we get:
f = 1/0.5 D
f = 2 m
Hence, the focal length of the lens is 2 m.
Therefore, the correct option is (c) a convex lens of focal length 2 m.
Explanation:
A convex lens has a positive power and can converge the light rays to a point. The focal length of a convex lens is positive. When the power of the lens is given, we can find the focal length of the lens using the formula P = 1/f. Here, the power is given as 0.5 D. On substituting the values, we get the focal length as 2 m. Hence, the lens is a convex lens of focal length 2 m.
A lens has a power of +0.5 D. It isa)a concave lens of focal length 5 ...
If the lens has a power of + 0.5d. Which type of lens is this or what is the focal length