What is short sightedhess or myopia? What are the causes of this defect? By which lens this defect can be corrected?

What is sehottky defect?

Which has Frenkel defect ?

What is an ideal crystal ? Name the types of the defects which arise in a crystal.

What are metal excess defects in crystals ? How are these caused ?

What are the problems caused due to defective feeding of infants?

What is the effect of Schottky defect on the density of crystal ?

What are non-stoichiometric defects? Give two example of such defects.

What is Schottky defect? Is it a stoichiometric or non-stoichiometric defect? What type of ionic crystals are likely to show this type of defect? Does the presence of this defect in a crystal increase or decrease the density of the crystal? Explain.

Which of the following defects decrease the density ?