(d) Between the pole of the mirror and its principal focus. The position of the object should be between the pole and principal focus.
(d) Clay cannot be used to make a lens because the light rays cannot pass through clay.
The focal length of the concave lens (f) = 2 m Power of lens (P) = 1/f(in m) = 1/ (-2) = -0.5D
The position of the image at 2F since the image is real and the same size. It is given that the image of the needle is formed at a distance of 50 cm from the convex lens. Therefore, the needle is placed in front of the lens at a distance of 50 cm. Object distance …
Dioptre is the SI unit of power of lens, It is denoted by the letter D. 1 dioptre can be defined as the power of a lens of focal length 1 metre. Power of lens (P) = 1 / f (in m) S.I unit of Power = m-1 or, Diopter (D)
A diamond’s refractive index is 2.42, which means that compared to the speed of light in the air, it will slow down in a diamond by a factor of 2.42. In other words, the speed of light in a diamond is 1/2.42 times that of light in a vacuum.
Light moves faster in water as concerning kerosene & turpentine oil, as the refractive index of water is lower than that of kerosene and turpentine oil. The speed of light is inversely proportional to the refractive index(n).
Lowest optical density = AirHighest optical density = Diamond A medium’s refractive index and optical density are inversely proportional. The optical density of a medium depends on its refractive index, and vice versa. The table shows that the refractive indices of diamond and air are, respectively, the lowest and highest. As a result, diamond has …
