Different refractive errors require specific types of corrective lenses based on how they affect the focusing of light on the retina. Cataracts are a structural issue requiring surgical intervention.
Match List I with List II and select the correct answer using the code given below the Lists: List I (Disease) A. Hypermetropia B. Presbyopia C. Myopia D. Cataract List II (Remedy) 1. Concave lens 2. Bifocal lens 3. Surgery 4. Convex lens
Asked in UPSC NDA 1 2017 · Topic: Optics (Thin and Thick Lenses, lens combinations)
More Physics questions
- The radii of curvature of the faces of a double convex lens are 10 cm and 20 cm. The refractive index of the glass is 1.5. What is the power of this lens (in units of dioptre) ?
- Two convex lenses with power 2 dioptre are kept in contact with each other. The focal length of the combined lens system is
- The light energy escaping from the Sun can be spread by
- According to the New Cartesian Sign Convention, which one of the following is correct in respect of the formula $\frac{1}{f} = \frac{1}{v} + \frac{1}{u}$, where symbols have their usual meanings?
- What is the magnification produced by a concave lens of focal length 10 cm, when an image is formed at a distance of 5 cm from the lens?
- If the focal length of a convex lens is 50 cm, which one of the following is its power?
- Which one of the following statements regarding lenses is not correct ?
- A lens has a power of +2.0 Dioptre. Which one of the following statements about the lens is true ?