Focal length of lens is 0.75 m, what will be its refreactive power –
**Core Concept**
The refraction power of a lens is determined by its focal length, which is the distance between the lens and the point where parallel light rays converge. The refraction power is a measure of the lens's ability to bend light and is typically expressed in diopters (D).
**Why the Correct Answer is Right**
The formula to calculate the refraction power of a lens is: Refraction Power (D) = 1 / Focal Length (m). Given the focal length of the lens is 0.75 m, we can plug this value into the formula to calculate the refraction power. This results in a refraction power of 1 / 0.75 m = 1.33 D. This means the lens has a refractive power of 1.33 diopters.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is not provided.
**Option B:** There is no calculation or formula provided to support this answer.
**Option C:** Without knowing the focal length, we cannot calculate the refraction power.
**Clinical Pearl / High-Yield Fact**
Remember, the refraction power of a lens is inversely proportional to its focal length. This means that as the focal length increases, the refraction power decreases, and vice versa.
**Correct Answer:**. 1.33 D