Defects in image

Myopia (near-sightedness) is a defect in human eye in which the image is formed

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.

which of the follwing defects is also known as dislocation defect ?

which of the follwing defects is also known as dislocation defect ?

Which of the following defects is also known as dislocation defect?

which of the follwing defects is also known as dislocation defect ?

Assertion (A) Both Frenkel and Schottky defects are stoichiometric defects. Reason (R ) Both defects change the density of the crystalline solid.

Explain Frenkel defect in ionic crystals. What type of compounds exhibit this defect ?

What are point defects in crystals ? Describe the Schottky defects in crystals.

Name the defect in the following crystal: