questions on defects

Answer the following questions. How does the defect of myopia arise in a human eye?

Defects|Type Of Point Imperfections And Defects|Stoichiometric Defects|Non - Stoichiometric Defects|Question|OMR

Defects are basically irregularities in the arrangement of constituent particles. Broadly speaking the defects are of two types. Namely point defects and line defects. Point defects: The irregularities or deviations from ideal arrangement around a point or an atom in the crystalline substance. Line defects : The irregularities or deviations from ideal arrangement in enitre row of lattice points. Answer the following questions. Select the correct statements : (i) Frenkel defect create a vacancy defect at its original site and an interstitial defect at its new position. (ii) Frenkel defect is stoichiometric point defect. (iii) Frenkel defect is alos called dislocation defect. (iv) Silver halide shows Frenkel defect.

Impurity defect|Problems based on defects

What is point defects. Describe two types of point defects.

What are the two most common defects of vision (or defects of eye) ? How are they corrected ?

Observe the following diagram and answer the questions. Which eye defect is shown in this diagram ?